host.tools
80+ tools · live multi-region checks · public REST API

The ultimate webmaster toolkit.
One smart input.

Paste an IP, domain, URL, email, ASN or CIDR. host.tools auto-detects what you gave it and runs the right tool — DNS, WHOIS, SSL, SMTP, traceroute, security scan, all in one place.

Try: host.com 1.1.1.1 AS13335 https://checkhost.com [email protected]
80+
specialised tools
12
probe regions
15
global resolvers
~50ms
cached p50 lookup
Tool catalogue

Everything a webmaster needs

Categorised, deeply detailed, fast as light. Browse all 80 →

7 tools

DNS

Records, propagation, trace, DNSSEC, zone transfer

  • DNS lookup (dig)
  • DNS propagation live
  • Reverse DNS (PTR)
  • DNS chain trace
  • Wildcard detector
  • + 2 more →
7 tools

IP

Geolocation, WHOIS, ASN, reverse, subnet calc

  • ASN lookup
  • IP geolocation
  • Reverse IP / hosted domains
  • Subnet / CIDR calculator
  • IP type detector
  • + 2 more →
4 tools

Domain

WHOIS, availability, IDN, TLD info, subdomains

  • Domain availability
  • Punycode / IDN converter
  • Domain WHOIS
  • Subdomain enumerator
2 tools

SSL/TLS

Certificate info, chain, HSTS, expiry

  • HSTS preload check
  • SSL certificate inspector
Sponsored host.tools Pro
Bulk lookups · monitors · webhooks · 10,000 API calls/day

Upgrade to Pro for $19/mo. Cancel anytime. Works with the same API you already use.
13 tools

HTTP

Headers, security headers, redirects, robots, sitemap

  • Hreflang validator
  • HTTP headers
  • OpenGraph & Twitter Card preview
  • Page weight & timing
  • Redirect chain tracer
  • + 8 more →
7 tools

Email

MX, SMTP, SPF, DKIM, DMARC, blacklists

  • Email blacklist (RBL) check
  • DKIM tester
  • DMARC tester
  • Email auth all-in-one
  • MX lookup
  • + 2 more →
5 tools

Network

Ping, traceroute, port scan, multi-region live checks

  • Multi-region HTTP availability live
  • Multi-region ping live
  • Multi-region TCP port check live
  • Port scanner
  • Traceroute (live) live
2 tools

Security

Cookies, CORS, CSP analyser

  • Cookie audit
  • CORS tester
7 tools

Encoders

Base64, URL, HTML entities, hash, HMAC, JWT, data: URI

  • Base64 encode / decode
  • Hash & checksum
  • HMAC generator
  • HTML entities ↔ text
  • Image → data: URI
  • + 2 more →
9 tools

Generators

Passwords, UUIDs, QR, lorem, .htaccess, robots, sitemap, CSP, htpasswd

  • CSP header builder
  • .htaccess generator
  • .htpasswd generator
  • Lorem ipsum generator
  • Password generator
  • + 4 more →
8 tools

Converters

JSON / YAML / CSV, color, case, number-base, timestamp, markdown

  • String case converter
  • Color converter
  • CSV ↔ JSON
  • JSON formatter / validator
  • Markdown ↔ HTML
  • + 3 more →
4 tools

Text

Diff, regex, text stats, slug

  • Regex tester
  • Slug generator
  • Text diff
  • Text & word counter
5 tools

Reference

HTTP status codes, well-known ports, User-Agent, MAC OUI, cron

  • Cron expression parser
  • HTTP status code reference
  • MAC address / OUI lookup
  • Well-known ports reference
  • User-Agent parser

One smart input

Paste anything. We auto-detect IPv4, IPv6, CIDR, domain, URL, email, ASN, hash, MAC, UUID — and route to the right tool with the right defaults. Power users keep typing; advanced options are one click away.

Real multi-region checks

Ping, HTTP, TCP, UDP and DNS propagation execute from a fleet of probe nodes across the globe. Results stream in over Server-Sent Events — see each region as it reports, not a frozen spinner.

Public REST API

Every web tool has a sibling /api/v1/<slug> JSON route. Free tier 100/h, Pro 10k/day. Discoverable at /api/v1/tools.json.

Smart routing

Built for speed of thought

Don't pick a tool. Just paste — host.tools picks for you.

IPv4
1.1.1.1
IP geolocation, WHOIS, ASN, ports
Domain
cloudflare.com
DNS, WHOIS, SSL, headers, security
ASN
AS13335
Prefixes, peers, geo footprint
CIDR
10.0.0.0/8
Subnet calculator, host range, broadcast
URL
https://example.com
HTTP headers, redirects, SSL, security
Email
[email protected]
MX, SPF, DKIM, DMARC, deliverability
IPv6
2606:4700::1111
Geo, reverse DNS, expansion, ASN
Hash
5d41402abc4b…
MD5/SHA1/SHA256/SHA512 detect & convert
vs the alternatives

Why teams switch to host.tools

Capability host.tools MXToolBox DNSChecker SecurityHeaders SSL Labs
Total tools 80+ ~30 ~25 1 1
Smart auto-detect ✓ — — — —
Multi-region probes 12 partial ✓ — —
SSE live streaming ✓ — — — —
Public REST API ✓ ✓ (paid) — — ✓
Modern UI / dark mode ✓ — partial partial —
Bulk lookups ✓ ✓ (paid) — — —
Webhook + Slack ✓ — — — —
Free tier API 100/h — — — ✓
Loved by

Operators, SREs, devs.

“

"Replaced four bookmarks with one paste. The smart-input router is the killer feature."

CTO · devops shop, Berlin
“

"The multi-region propagation check is faster and clearer than dnschecker.org."

SRE Lead · fintech, NYC
“

"We use the API to wire SSL-expiry alerts into our PagerDuty. Zero noise, zero misses."

Head of Eng · SaaS, London
FAQ

Frequently asked

Is everything really free?
Yes — every tool runs free on the web with a 200/hour rate limit per IP. The matching API is free up to 100 requests/hour, no key required. Pro adds bulk + monitors + history at $19/mo.
How do you make money?
Pro/Team/Enterprise subscriptions, sponsored placements clearly marked as such, and partner data licensing. Never your data — we don't sell it.
Can I use this commercially?
Yes. The free tier covers commercial diagnostic use; for embedding/white-label/private nodes, see Pricing.
Where do the probes run from?
12 default regions (US-East/West, DE, UK, FR, NL, SG, JP, BR, AU, IN, ZA) plus a local node for offline dev. Enterprise customers can add private nodes inside their own VPCs.
Is my query data stored?
Inputs and outputs sit in cache up to 1 hour to make repeat queries instant. We don't share with ad networks or build cross-site profiles. See Privacy.
Can I monitor results over time?
Pro lets you schedule any tool to run every 1/5/15/60 min and alert on diff via webhook + email + Slack. See monitors.

Get one good post a week.

DNS quirks, email-auth deep dives, security-header playbooks. No spam — unsubscribe in one click.

Public REST API

Every tool, scriptable.

Same payloads as the web UI. JSON in, JSON out. Cache headers respected. Rate-limited fairly.

Read the docs /api/v1/tools.json 
# Detect what you have
curl https://host.tools/api/v1/detect?q=cloudflare.com

# Run any tool — JSON in, JSON out
curl https://host.tools/api/v1/dns/lookup?q=cloudflare.com&type=MX

# Subscribe to live multi-region propagation
curl -N https://host.tools/stream/dns/propagation?q=cloudflare.com

Ready to inspect anything?

Press ⌘K to open the command palette, or paste at the top of the page.

All 80 tools Get API access