All 80 tools

DNS lookup (dig)

Query A, AAAA, MX, TXT, CNAME, NS, SOA, SRV, CAA, PTR — all types at once.

DNS propagation

live

Query 15 global resolvers — see if your DNS change has propagated worldwide.

Reverse DNS (PTR)

Find the PTR / hostname for an IPv4 or IPv6 address.

DNS chain trace

Walk the resolution chain: TLD → authoritative NS → final answer.

Wildcard detector

Detect catch-all wildcard records on a domain.

Zone transfer (AXFR) test

Check whether your authoritative name servers leak the full zone via AXFR.

DNSSEC validator

Check the DS / DNSKEY chain to see whether DNSSEC is signed for a zone.

ASN lookup

Resolve an IP or AS number to its autonomous system, prefixes, country.

IP geolocation

Country, region, city, ASN, org, timezone, abuse contact for any IP.

Reverse IP / hosted domains

Find other domains that resolve to the same IP.

Subnet / CIDR calculator

Network, broadcast, host range, mask, wildcard, hex, binary, total hosts.

IP type detector

Datacenter, residential, mobile, Tor, VPN or proxy classification.

IP WHOIS

Direct port-43 WHOIS at the appropriate RIR (ARIN, RIPE, APNIC, LACNIC, AFRINIC).

My IP

Show your public IPv4/IPv6 with geolocation and ASN.

Domain availability

Check if a name is available across 20+ popular TLDs.

Punycode / IDN converter

Convert internationalised domain names to/from xn-- ASCII form.

Domain WHOIS

Registrar, dates, name servers, contacts, DNSSEC status.

Subdomain enumerator

Discover subdomains via Certificate Transparency logs (crt.sh).

HSTS preload check

Is your domain on the Chromium HSTS preload list?

SSL certificate inspector

Issuer, SAN, validity, fingerprints, full chain — for any TLS endpoint.

Hreflang validator

Find every <link rel="alternate" hreflang="…"> on a page and validate it.

HTTP headers

Capture every response header, follow redirects, time each hop.

OpenGraph & Twitter Card preview

Preview how your URL looks when shared on Facebook, Twitter, LinkedIn, Slack.

Page weight & timing

Real-network fetch with full timing breakdown — DNS / connect / TLS / TTFB / total / payload size / compression.

Redirect chain tracer

Step-by-step view of every redirect with status, latency and location.

robots.txt parser

Fetch and parse robots.txt — User-agent groups, Disallow/Allow, Sitemap, Crawl-delay.

Schema.org validator

Pull JSON-LD blocks from a page and validate the @type / required fields.

Security headers grader

A+ to F grade for HSTS, CSP, X-Frame-Options, COOP, Referrer-Policy and more.

sitemap.xml inspector

Fetch and parse sitemap or sitemap-index, list URLs with lastmod, priority.

HTTP status check

Quick, single-shot status code + content-type for any URL.

Tech stack detector

CMS, framework, server, CDN, analytics fingerprints.

URL inspector (GSC-style)

Indexability, canonical, robots, hreflang, schema, security — all in one.

.well-known inspector

Probe RFC 8615 .well-known files: security.txt, change-password, openid, mta-sts, etc.

Email blacklist (RBL) check

Query 16+ public RBLs in parallel — Spamhaus, Barracuda, Spamcop, SORBS, more.

DKIM tester

Look up DKIM keys for any selector. Auto-tries common selectors.

DMARC tester

Parse the DMARC record, classify policy, list aggregate/forensic recipients.

Email auth all-in-one

SPF + DKIM + DMARC + BIMI + MTA-STS + TLS-RPT in a single shot.

MX lookup

Resolve mail-exchange records, sort by priority, banner-test SMTP.

SMTP test

Connect, EHLO, STARTTLS, capture banner & supported extensions.

SPF tester

Inspect, validate, expand a domain's SPF record. Lookup-budget aware.

Multi-region HTTP availability

live

TTFB, status, redirect chain from each region.

Multi-region ping

live

Ping from probe nodes worldwide. Streams per region.

Multi-region TCP port check

live

Open / closed / filtered status of any TCP port from each region.

Port scanner

Probe the most-common 20 service ports — or a custom list.

Traceroute (live)

live

Stream every hop with RTT — Windows tracert / Linux traceroute under the hood.

Cookie audit

Inspect Set-Cookie headers — Secure / HttpOnly / SameSite / domain / path.

CORS tester

Probe Access-Control-* headers from a chosen Origin & method.

Base64 encode / decode

Standard and URL-safe Base64 in both directions.

Hash & checksum

MD5, SHA1, SHA224, SHA256, SHA384, SHA512, CRC32, BLAKE2 — for any text.

HMAC generator

HMAC-SHA1/256/512 of any text with any key.

HTML entities ↔ text

Encode special characters to entities, or decode them back.

Image → data: URI

Fetch an image from URL and base64-encode it as a data: URI for inlining.

JWT decoder

Decode header, payload, signature. Show alg, typ, claims, expiry status.

URL encode / decode

percent-encode + parse a URL into scheme, host, path, query.

CSP header builder

Build a Content-Security-Policy from sane defaults — strict, modern, copy-paste ready.

.htaccess generator

Generate .htaccess for HTTPS redirect, www canonicalisation, gzip, headers, hotlink block.

.htpasswd generator

Apache htpasswd hashes (bcrypt, SHA, APR1) for any user/password.

Lorem ipsum generator

Filler text in paragraphs, sentences, words or list items.

Password generator

Strong passwords with adjustable length, charset, entropy meter.

QR code generator

Generate a QR code for any URL or text — PNG/SVG download.

robots.txt generator

Generate a robots.txt with sensible disallows, sitemap declaration, optional bot blocks.

sitemap.xml generator

Build a sitemap.xml from a URL list. Supports lastmod, priority, changefreq.

UUID generator

Generate UUID v4 / v7 / nil. Decode UUIDv1 timestamp.

String case converter

camelCase, snake_case, kebab-case, PascalCase, SCREAMING_SNAKE, Title Case, sentence case.

Color converter

HEX ↔ RGB ↔ HSL ↔ HSV ↔ CMYK with on-the-fly preview.

CSV ↔ JSON

Auto-detect and convert CSV to JSON, or JSON to CSV. Handles quoted fields, custom delimiters.

JSON formatter / validator

Pretty-print, validate, minify JSON. Reports the exact error position.

Markdown ↔ HTML

Render markdown to safe HTML, or strip HTML tags back to plain markdown.

Number base converter

Convert between binary, octal, decimal, hex (base 2 / 8 / 10 / 16) plus arbitrary base.

Unix timestamp converter

Unix epoch ↔ ISO 8601 ↔ RFC 2822, multiple timezones.

YAML ↔ JSON

Convert between YAML and JSON. Auto-detects direction.

Regex tester

Test PCRE patterns, capture groups, named captures and replacement.

Slug generator

URL-safe slugs from any text — handles unicode, whitespace, casing.

Text diff

Line-by-line diff between two text blocks. Insertions, deletions, unchanged.

Text & word counter

Characters, words, sentences, lines, reading time, byte length.

Cron expression parser

Translate cron syntax to plain English and preview the next 10 fire times.

HTTP status code reference

Quick reference for every HTTP status — 100 to 599. RFC reference + safe to retry.

MAC address / OUI lookup

Identify the manufacturer behind a MAC address (first 24 bits = OUI).

Well-known ports reference

TCP/UDP service-port reference. Lookup a number, see the protocol.

User-Agent parser

Parse User-Agent strings — browser, engine, OS, device, bot detection.