Block abusive IPs before they hit your app: one call against 7 DNSBLs
Querying DNSBLs by hand means reversing the IP, appending each blacklist's zone, doing a DNS query per list, and interpreting the return codes — times seven if you want decent coverage. It's a lot of boilerplate for "is
Querying DNSBLs by hand means reversing the IP, appending each blacklist's zone, doing a DNS query per list, and interpreting the return codes — times seven if you want decent coverage. It's a lot of boilerplate for "is this IP a known spam/abuse source?".
One GET checks an IP against Spamhaus, Barracuda, SORBS, SpamCop, UCEPROTECT and more, and tells you which lists flagged it:
curl --request GET \
--url 'https://ip-reputation-blacklist-checker-api.p.rapidapi.com/api/v1/check?ip=1.2.3.4' \
--header 'x-rapidapi-key: YOUR_RAPIDAPI_KEY' \
--header 'x-rapidapi-host: ip-reputation-blacklist-checker-api.p.rapidapi.com'
You get a per-list breakdown plus an overall verdict. GET /api/v1/lists shows the active blacklists, and POST /api/v1/check/batch checks up to 10 IPs at once — good for scoring signups or filtering a request log.
Free tier on RapidAPI: https://rapidapi.com/danieligel/api/ip-reputation-blacklist-checker-api
I built this to gate form submissions without standing up my own DNSBL resolver. How do you currently screen inbound IPs?
Originally published by Dev.to Security. Aggregated on AIWithGhost for educational purposes — full credit and traffic to the original publisher.