Developer finds 4 client domains near expiry while testing RDAP-based monitor on agencies

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A developer built a domain expiry monitoring tool and tested it against client sites publicly listed by 30 US web design agencies, checking 65 domains via RDAP rather than traditional WHOIS. The audit found one domain had already expired 60 days prior, three were within 45 days of expiry — one with just three days remaining — while the rest had between 46 days and several years left. RDAP, which returns structured JSON over HTTPS unlike WHOIS's inconsistent free-text output, proved more reliable, though gaps exist: some TLDs like .de and .co have no authoritative RDAP endpoint, meaning any expiry date shown for them is an estimate. The developer also documented pitfalls such as miscrawled third-party links being mistaken for client domains and multi-part suffixes like co.uk being incorrectly parsed. The agency and domain names were withheld to avoid publicly exposing clients' renewal vulnerabilities.

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