zlookup.com
Reverse phone lookup tool for finding caller names and basic public details from phone numbers.
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spydialer.com
Free reverse phone lookup for checking names, voicemail, address clues, and other public number details.
whocalledme.com
Community phone lookup site for checking unknown callers, spam reports, and user comments on numbers.
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.