Tracking Reference

Broad attribution parameter coverage forEVENTS Gateway

This public page lists every parameter currently captured intoclick_idsby the browser tracker. The list is generated from the current tracker source so it stays aligned with production behavior.

Back to Docs Open Pricing

Coverage

One public reference for every tracked attribution parameter.

This reference covers broad marketing attribution, not only strict ad click identifiers. It includes ad platform IDs, ESP parameters, campaign metadata, referral metadata, and selected cookie-derived identifiers.

260 tracked parameters

Total parameters currently listed on this page from the active tracker implementation.

48 ad click IDs

Strict or near-strict ad click identifiers from major ad platforms and partner tools.

80 email and CRM IDs

Parameters used by ESP, CRM, lifecycle, newsletter, and onsite tracking tools.

132 broad attribution fields

Campaign, referral, analytics, and deep-link metadata captured for broader attribution context.

What This Page Is

A live implementation reference.

This page is based on the exact parameter list used by the current tracker source. It is useful when you need to confirm whether a marketing platform or ESP-specific parameter is recognized on landing.

Query parameters are matched case-insensitively.
Most listed keys are captured from either the URL query string or a cookie with the same name.
Some values are cookie-derived aliases, such asfbc,fbp, and__kla_id.
The browser tracker uses broad capture by design so teams can preserve more attribution context at landing time.

Typical Sources

Examples of platforms represented here.

The parameter list covers major ad platforms plus email, CRM, affiliate, analytics, and deep-link tooling.

Google Ads, Meta Ads, Microsoft Ads, TikTok, X, LinkedIn, Pinterest, Snapchat, Reddit, Taboola, Outbrain, Quora, Yahoo, and Yandex.

Email and CRM

Brevo, Klaviyo, Mailchimp, Marketo, HubSpot, Omnisend, MailerLite, BlueShift, Vero, Customer.io, and related lifecycle tools.

Partner and affiliate

Awin, ShareASale, CJ, Impact Radius, Redbrain, and other partner-driven campaign links.

Analytics and deep links

Adobe, Matomo, Branch, referral metadata, and campaign transport values used across attribution stacks.

Parameter List

Every parameter currently recognized by the tracker.

Use this table as the public reference for the current tracker implementation.

Parameter	Bucket	Typical Source
`__hsfp`	Email and CRM attribution	HubSpot
`__hssc`	Email and CRM attribution	HubSpot
`__hstc`	Email and CRM attribution	HubSpot
`__kla_id`	Cookie-derived attribution	Klaviyo browser cookie
`__s`	Email and CRM attribution	Mixed marketing and attribution tooling
`_bhlid`	Email and CRM attribution	Mixed marketing and attribution tooling
`_branch_match_id`	Analytics, referral, or deep-link metadata	Branch
`_branch_referrer`	Analytics, referral, or deep-link metadata	Branch
`_hsenc`	Email and CRM attribution	HubSpot
`_hsmi`	Email and CRM attribution	HubSpot
`_ke`	Email and CRM attribution	Mixed marketing and attribution tooling
`_kx`	Email and CRM attribution	Klaviyo
`_openstat`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`_sc`	Email and CRM attribution	Brevo
`_se`	Email and CRM attribution	Brevo
`_z1_agid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`_z1_caid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`_z1_msid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`_z1_pub`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`ac_campaign_id`	Email and CRM attribution	ActiveCampaign
`ac_contact_id`	Email and CRM attribution	ActiveCampaign
`ac_email_id`	Email and CRM attribution	ActiveCampaign
`ad_id`	Campaign and ad metadata	Mixed marketing and attribution tooling
`adgroup_id`	Campaign and ad metadata	Mixed marketing and attribution tooling
`adid`	Ad click identifier	Campaign and partner tracking
`adj_adgroup`	Campaign and ad metadata	Adjust
`adj_campaign`	Campaign and ad metadata	Adjust
`adj_creative`	Campaign and ad metadata	Adjust
`adj_deeplink`	Campaign and ad metadata	Adjust
`adj_fallback`	Campaign and ad metadata	Adjust
`adj_label`	Campaign and ad metadata	Adjust
`adj_t`	Campaign and ad metadata	Adjust
`adobe_mc_ref`	Analytics, referral, or deep-link metadata	Adobe
`adobe_mc_sdid`	Analytics, referral, or deep-link metadata	Adobe
`adset_id`	Campaign and ad metadata	Mixed marketing and attribution tooling
`af_ad_id`	Campaign and ad metadata	AppsFlyer
`af_adset_id`	Campaign and ad metadata	AppsFlyer
`af_c_id`	Campaign and ad metadata	AppsFlyer
`af_prt`	Campaign and ad metadata	AppsFlyer
`af_siteid`	Campaign and ad metadata	AppsFlyer
`af_sub_siteid`	Campaign and ad metadata	AppsFlyer
`af_sub1`	Campaign and ad metadata	AppsFlyer
`af_sub2`	Campaign and ad metadata	AppsFlyer
`af_sub3`	Campaign and ad metadata	AppsFlyer
`af_sub4`	Campaign and ad metadata	AppsFlyer
`af_sub5`	Campaign and ad metadata	AppsFlyer
`aff`	Analytics, referral, or deep-link metadata	Affiliate links
`aff_id`	Analytics, referral, or deep-link metadata	Affiliate links
`aff_sub`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`aff_sub2`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`aff_sub3`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`aff_sub4`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`aff_sub5`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`affid`	Analytics, referral, or deep-link metadata	Affiliate links
`affiliate_id`	Analytics, referral, or deep-link metadata	Affiliate links
`afftrack`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`afid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`alart`	Campaign and ad metadata	AppLovin Axon Ads
`aleid`	Ad click identifier	AppLovin Axon Ads
`ao_noptimize`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`at_recipient_id`	Email and CRM attribution	Mixed marketing and attribution tooling
`at_recipient_list`	Email and CRM attribution	Mixed marketing and attribution tooling
`auctid`	Ad click identifier	Mixed marketing and attribution tooling
`aw_adid`	Campaign and ad metadata	Mixed marketing and attribution tooling
`awc`	Ad click identifier	Awin
`awclid`	Ad click identifier	Affiliate and partner links
`bbeml`	Email and CRM attribution	Mixed marketing and attribution tooling
`bhcid`	Email and CRM attribution	Mixed marketing and attribution tooling
`braze_id`	Email and CRM attribution	Braze
`brz_euid`	Email and CRM attribution	Braze
`bsft_aaid`	Email and CRM attribution	BlueShift
`bsft_clkid`	Email and CRM attribution	BlueShift
`bsft_uid`	Email and CRM attribution	BlueShift
`c`	Campaign and ad metadata	AppsFlyer
`campaign`	Campaign and ad metadata	Mixed marketing and attribution tooling
`campaign_id`	Campaign and ad metadata	Mixed marketing and attribution tooling
`campaignid`	Campaign and ad metadata	Impact Radius or partner tracking
`cid`	Campaign and ad metadata	Mixed marketing and attribution tooling
`cio_campaign_id`	Email and CRM attribution	Customer.io
`cio_delivery_id`	Email and CRM attribution	Customer.io
`cio_id`	Email and CRM attribution	Customer.io
`cio_message_id`	Email and CRM attribution	Customer.io
`cjdata`	Ad click identifier	Commission Junction
`cjevent`	Ad click identifier	Commission Junction
`ck_subscriber_id`	Email and CRM attribution	Mixed marketing and attribution tooling
`click_id`	Ad click identifier	Generic click tracking
`clickid`	Ad click identifier	Mixed marketing and attribution tooling
`clickref`	Ad click identifier	Affiliate and partner links
`cn_reloaded`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`convertkit_subscriber_id`	Email and CRM attribution	ConvertKit
`ct_adid`	Campaign and ad metadata	Mixed marketing and attribution tooling
`ct_click_id`	Ad click identifier	Cointraffic
`ct_params`	Campaign and ad metadata	Mixed marketing and attribution tooling
`cto_pld`	Ad click identifier	Criteo
`customid`	Ad click identifier	Affiliate and network sub-tracking
`cvid`	Campaign and ad metadata	Mixed marketing and attribution tooling
`czclickid`	Ad click identifier	CyberTargeter
`dclid`	Ad click identifier	Google Display and Campaign Manager
`deep_link_sub1`	Campaign and ad metadata	AppsFlyer deep link metadata
`deep_link_sub2`	Campaign and ad metadata	AppsFlyer deep link metadata
`deep_link_sub3`	Campaign and ad metadata	AppsFlyer deep link metadata
`deep_link_sub4`	Campaign and ad metadata	AppsFlyer deep link metadata
`deep_link_sub5`	Campaign and ad metadata	AppsFlyer deep link metadata
`dicbo`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`drip_email_id`	Email and CRM attribution	Drip
`drip_subscriber_id`	Email and CRM attribution	Drip
`ef_id`	Ad click identifier	Mixed marketing and attribution tooling
`eid`	Campaign and ad metadata	Mixed marketing and attribution tooling
`elq_cid`	Email and CRM attribution	Oracle Eloqua
`elq_mid`	Email and CRM attribution	Oracle Eloqua
`elqCampaignId`	Email and CRM attribution	Oracle Eloqua
`elqTrack`	Email and CRM attribution	Oracle Eloqua
`elqTrackId`	Email and CRM attribution	Oracle Eloqua
`epik`	Ad click identifier	Pinterest Ads
`et_rid`	Email and CRM attribution	Mixed marketing and attribution tooling
`fb_action_ids`	Campaign and ad metadata	Mixed marketing and attribution tooling
`fb_action_types`	Campaign and ad metadata	Mixed marketing and attribution tooling
`fb_ref`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`fb_source`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`fbc`	Cookie-derived attribution	Meta browser cookie
`fbclid`	Ad click identifier	Meta Ads
`fbp`	Cookie-derived attribution	Meta browser cookie
`ga_adcid`	Campaign and ad metadata	Mixed marketing and attribution tooling
`ga_adgid`	Campaign and ad metadata	Mixed marketing and attribution tooling
`ga_adid`	Campaign and ad metadata	Mixed marketing and attribution tooling
`gbraid`	Ad click identifier	Google Ads iOS and Safari traffic
`gci`	Campaign and ad metadata	Mixed marketing and attribution tooling
`gclid`	Ad click identifier	Google Ads
`gclsrc`	Ad click identifier	Google Ads click source
`guce_referrer`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`guce_referrer_sig`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`h_sid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`h_slt`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`hsCtaTracking`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`ICID`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`igsh`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`igshid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`invite_id`	Email and CRM attribution	Referral and invite links
`inviter_id`	Email and CRM attribution	Referral and invite links
`irclickid`	Ad click identifier	Impact Radius
`iterableEmailCampaignId`	Email and CRM attribution	Iterable
`iterableEmailId`	Email and CRM attribution	Iterable
`iterableEndUserId`	Email and CRM attribution	Iterable
`iterableMessageId`	Email and CRM attribution	Iterable
`iterableTemplateId`	Email and CRM attribution	Iterable
`li_adid`	Campaign and ad metadata	LinkedIn campaign metadata
`li_fat_id`	Ad click identifier	LinkedIn Ads
`mc_cid`	Email and CRM attribution	Mailchimp
`mc_eid`	Email and CRM attribution	Mailchimp
`mkt_tok`	Email and CRM attribution	Marketo
`ml_recipient`	Email and CRM attribution	Mixed marketing and attribution tooling
`ml_subscriber`	Email and CRM attribution	MailerLite
`ml_subscriber_hash`	Email and CRM attribution	MailerLite
`mpid`	Campaign and ad metadata	Impact Radius or partner tracking
`msclkid`	Ad click identifier	Microsoft Ads
`mtm_cid`	Analytics, referral, or deep-link metadata	Matomo Tag Manager
`ndclid`	Ad click identifier	Nextdoor Ads
`ob_click_id`	Ad click identifier	Outbrain
`oft_c`	Email and CRM attribution	Mixed marketing and attribution tooling
`oft_campaign`	Email and CRM attribution	Mixed marketing and attribution tooling
`oft_ck`	Email and CRM attribution	Mixed marketing and attribution tooling
`oft_d`	Email and CRM attribution	Mixed marketing and attribution tooling
`oft_id`	Email and CRM attribution	Mixed marketing and attribution tooling
`oft_ids`	Email and CRM attribution	Mixed marketing and attribution tooling
`oft_k`	Email and CRM attribution	Mixed marketing and attribution tooling
`oft_lk`	Email and CRM attribution	Mixed marketing and attribution tooling
`oft_sk`	Email and CRM attribution	Mixed marketing and attribution tooling
`oicd`	Email and CRM attribution	Mixed marketing and attribution tooling
`oly_anon_id`	Email and CRM attribution	Mixed marketing and attribution tooling
`oly_enc_id`	Email and CRM attribution	Mixed marketing and attribution tooling
`omnisendAttributionID`	Email and CRM attribution	Omnisend
`omnisendContactID`	Email and CRM attribution	Omnisend
`otc`	Email and CRM attribution	Mixed marketing and attribution tooling
`outbrain_click_id`	Ad click identifier	Outbrain
`partner_id`	Analytics, referral, or deep-link metadata	Partner links
`partnerid`	Analytics, referral, or deep-link metadata	Partner links
`pi_ad_id`	Email and CRM attribution	Salesforce Account Engagement
`pi_campaign_id`	Email and CRM attribution	Salesforce Account Engagement
`pid`	Campaign and ad metadata	AppsFlyer
`pk_cid`	Analytics, referral, or deep-link metadata	Matomo
`pub_ref`	Analytics, referral, or deep-link metadata	Affiliate and publisher links
`pubref`	Analytics, referral, or deep-link metadata	Affiliate and publisher links
`qclid`	Ad click identifier	Quora Ads
`ranEAID`	Ad click identifier	Rakuten Advertising
`ranMID`	Ad click identifier	Rakuten Advertising
`ranSiteID`	Ad click identifier	Rakuten Advertising
`rb_clickid`	Ad click identifier	Redbrain
`rdt_cid`	Ad click identifier	Reddit Ads
`ref`	Analytics, referral, or deep-link metadata	Referral and affiliate links
`ref_id`	Analytics, referral, or deep-link metadata	Referral and affiliate links
`ref_src`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`ref_url`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`referral_id`	Analytics, referral, or deep-link metadata	Referral and affiliate links
`refid`	Analytics, referral, or deep-link metadata	Referral and affiliate links
`s_cid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`s_kwcid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`s1`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`s2`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`s3`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`s4`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`s5`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`sc_click_id`	Ad click identifier	Mixed marketing and attribution tooling
`sc_customer`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`sc_eh`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`sc_uid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`ScCid`	Ad click identifier	Snapchat Ads
`scid`	Ad click identifier	Mixed marketing and attribution tooling
`sendgrid_message_id`	Email and CRM attribution	SendGrid
`sfmc_activityid`	Email and CRM attribution	Salesforce Marketing Cloud
`sfmc_id`	Email and CRM attribution	Salesforce Marketing Cloud
`sfmc_journey_id`	Email and CRM attribution	Salesforce Marketing Cloud
`sfmc_journey_name`	Email and CRM attribution	Salesforce Marketing Cloud
`sfmc_mid`	Email and CRM attribution	Salesforce Marketing Cloud
`sfmc_sub`	Email and CRM attribution	Salesforce Marketing Cloud
`sfmc_subscriber_id`	Email and CRM attribution	Salesforce Marketing Cloud
`sg_email_id`	Email and CRM attribution	SendGrid
`ShareASale`	Analytics, referral, or deep-link metadata	ShareASale
`si`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`sid`	Broad attribution parameter	Affiliate and partner links
`siteid`	Campaign and ad metadata	Publisher and site tracking
`soc_src`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`soc_trk`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`source_id`	Analytics, referral, or deep-link metadata	Affiliate and partner links
`srsltid`	Ad click identifier	Google surfaces and ad redirects
`ss_email_id`	Email and CRM attribution	Mixed marketing and attribution tooling
`sscid`	Ad click identifier	Mixed marketing and attribution tooling
`sub_id`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`sub1`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`sub2`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`sub3`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`sub4`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`sub5`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`subafid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`subid`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`subid1`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`subid2`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`subid3`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`subid4`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`subid5`	Analytics, referral, or deep-link metadata	Affiliate sub-tracking
`tblci`	Ad click identifier	Taboola
`tduid`	Ad click identifier	Mixed marketing and attribution tooling
`tid`	Ad click identifier	Affiliate and partner links
`ttclid`	Ad click identifier	TikTok Ads
`twclid`	Ad click identifier	X Ads
`u1`	Analytics, referral, or deep-link metadata	Rakuten and affiliate sub-tracking
`u2`	Analytics, referral, or deep-link metadata	Rakuten and affiliate sub-tracking
`u3`	Analytics, referral, or deep-link metadata	Rakuten and affiliate sub-tracking
`unicorn_click_id`	Ad click identifier	Mixed marketing and attribution tooling
`utm_id`	Campaign and ad metadata	Cross-platform campaign metadata
`utm_source_platform`	Campaign and ad metadata	Cross-platform campaign metadata
`vero_conv`	Email and CRM attribution	Mixed marketing and attribution tooling
`vero_id`	Email and CRM attribution	Vero
`vgo_ee`	Email and CRM attribution	Mixed marketing and attribution tooling
`vmcid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`wbraid`	Ad click identifier	Google Ads app and iOS traffic
`wickedid`	Analytics, referral, or deep-link metadata	Mixed marketing and attribution tooling
`WT.mc_id`	Analytics, referral, or deep-link metadata	Adobe and WebTrends style campaign tracking
`yclid`	Ad click identifier	Yahoo Ads
`ymclid`	Ad click identifier	Yandex
`ysclid`	Ad click identifier	Yandex