Use cases

Built for the people who keep the internet running.

Here's how teams use host.tools every day — pick the workflow closest to yours.

DevOps / SRE

Multi-region propagation checks before deploy, SSL-expiry alerts piped into PagerDuty, traceroute snapshots when latency spikes.

DNS propagation SSL certificate inspector Traceroute (live) HTTP headers

Security teams

Cookie audits, CORS reviews, security-headers grading, subdomain enumeration via CT logs, blacklist sweeps.

Cookie audit CORS tester Security headers grader Subdomain enumerator Email blacklist (RBL) check

Email deliverability

SPF / DKIM / DMARC / BIMI / MTA-STS in one shot. RBL parallel sweep across 16+ lists. SMTP banner test.

Email auth all-in-one SPF tester DMARC tester Email blacklist (RBL) check SMTP test

SEO / web teams

GSC-style URL inspector, robots.txt parser, sitemap walker, OpenGraph preview, hreflang validator, page indexability.

URL inspector (GSC-style) robots.txt parser sitemap.xml inspector OpenGraph & Twitter Card preview HTTP headers

Domain investors

WHOIS history snapshots, multi-TLD availability sweeps, expiry watch, IDN/Punycode conversion.

Domain WHOIS Domain availability Punycode / IDN converter Subdomain enumerator

Hosting providers

Reverse-IP audits, ASN intelligence, port scans, abuse-contact lookups, regional reachability checks.

IP WHOIS ASN lookup Reverse IP / hosted domains Port scanner Multi-region ping

Penetration testers

Recon stack in one place — DNS dig, zone-transfer probes, cert chain forensics, tech-stack fingerprints, port sweeps. (Authorised testing only — see AUP.)

Zone transfer (AXFR) test SSL certificate inspector Tech stack detector Port scanner Subdomain enumerator

Indie devs & builders

Generators and codecs — JWT decoder, hash, Base64, color, UUID, password, regex, cron, htpasswd.

JWT decoder Hash & checksum UUID generator Regex tester Cron expression parser

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