Jetpack's built-in visitor analytics. It records page views, referring sites, search terms, and outbound link clicks, and also carries the shared visitor-tracking library used by Jetpack Instant Search and WooCommerce Analytics.
Service URL: automattic.com (opens in a new window)
tk_ai
Stores a randomly-generated anonymous visitor ID so Jetpack's Tracks analytics library can link tracking events to the same visitor.
Session in wp-admin; up to 5 years on the frontend
tk_qs
Queues analytics events for Jetpack's Tracks library so none are lost if the page closes before they can be sent.
30 minutes
tk_tc
Used once per page load to work out which cookie domain the Tracks library should use, then removed as soon as it's read back.
Session (deleted immediately after use)
tk_aip
Stores a list of anonymous visitor IDs so they can be merged into one identity once a visitor is recognized.
Up to 5 years
Kirk Kerekes
I try to use Speedify full-time on my iPhone, but occasionally things glitch and I have to re-connect it or shut it off. Also, it is implemented via VPS at various server farms, and as a result their IP addresses are often on various spam blacklists.
VPS servers have made blacklists obsolete, but that does not (unfortunately) stop some folks for using them anyway.
The blacklist problem is really not Speedify’s problem, except that they use VPS for their POPs.