Reverse Nameserver Lookup — Find Domains on a DNS Host

Domain WHOIS & DNS Lookup — Records & Registration

junipr/domain-whois-lookup

Look up public WHOIS, registrar, nameserver, DNS, MX, TXT, SPF, and expiration metadata for domains in bulk.

Domain DNS Footprint Auditor

glowing_glove/domain-dns-footprint-auditor

Audit domain DNS, MX, TXT, SPF, DMARC, nameserver, homepage, and security.txt signals for sales, security, and deliverability workflows.

Bulk Domain Search — Availability Checker for 1,075 TLDs

oswaldocarabano/domain-availability-screen

Bulk domain search and availability checker: paste up to 5,000 names and get a verdict for each, across 1,075 gTLDs. No WHOIS, no registrar API, no rate limits and no per-lookup fee — it reads the registries' own zone files, so a taken domain is certain and the rest are probably free.

Domain Hijacking Monitor — Nameserver Change Alerts

oswaldocarabano/delegation-change-monitor

Domain hijacking monitor: watch your domains and get alerted when their nameservers change in the registry zone. An unexpected delegation change is the classic sign of domain theft, and it lives in the zone file where ordinary domain monitoring services cannot see it.

Domain, DNS and SSL Report (bulk health check)

steadydata/domain-dns-ssl-report

One health report per domain, up to 500 per run: registration and expiry from the official RDAP registry, DNS records with mail and nameserver provider, SPF and DMARC policy, the TLS certificate with days remaining, and a ranked list of issues. Official protocols only.

Domain Registration Lookup Scraper

automation-lab/domain-rdap-lookup

Look up domain registration, registrar, status, nameserver, and expiry data through authoritative public RDAP services.

DNS Lookup

superlativetech/dns-lookup

Bulk DNS records lookup. Query MX, SPF, DMARC, DKIM, TXT, CNAME, A, AAAA, NS, SOA and reverse DNS for any domain or IP. Batch thousands or query one instantly using the Standby API. For domain registration data, see WHOIS Lookup.

Bulk DNS lookup API for domain records. Check A, AAAA, MX, NS, TXT, CNAME, SOA, and SRV records across many domains for email deliverability, SPF/DKIM/DMARC checks, DNS migrations, security audits, and infrastructure monitoring.

WHOIS & DNS Lookup Tool

darknezz/whois-dns-lookup

Comprehensive WHOIS and DNS lookup for any domain. Get registration data, name servers, all DNS record types (A, AAAA, MX, NS, TXT, SOA, CAA, SRV), SPF/DMARC email security, and IP resolution in one call. Perfect for domain research, security audits, and infrastructure analysis.