github.com
Bellingcat tool for checking Telegram phone-number exposure and account discovery signals.
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haveibeenzuckered.com
Checker for seeing whether a phone number or profile appears in Facebook-related breach data.
validnumber.com
Valid Number offers a free reverse phone lookup service that retrieves available information for phone numbers and lets users validate a number and identify an associated caller. Users can report suspicious calls from the results page, and a list of recently looked-up numbers reported as unsafe is shown.
ipvoid.com
IPVoid is a free service from NoVirusThanks Company Srl offering online IP address, network and DNS tools. It began in 2010 as an IP blacklist checker and later added more tools, now numbering more than 80, usable from a web browser without registration.
sickw.com
SickW is an online checker for IMEI, MEID, serial and ESN numbers, covering brands including Apple, iPhone, Samsung, Oppo, Xiaomi and OnePlus. It offers free limited daily checks alongside a service list, a shopping cart, IMEI/SN photo recognition and a Telegram bot.