DNS Propagation Checker
Check a domain against public resolvers worldwide. Paste a full URL if you like — the protocol and path are stripped automatically.
DNS
7DNS Propagation CheckerDNS
Compare how public resolvers worldwide answer the same DNS query, with TTLs and consensus.
DNS Records CheckerDNS
Look up A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, SRV and PTR records for a domain.
DNSSEC CheckerDNS
Checks DNSKEY, DS, RRSIG and resolver validation to assess a zone's DNSSEC status.
Domain to IP LookupDNS
Resolve a domain to its IPv4 and IPv6 addresses, with hosting location and network owner.
NS LookupDNS
List a domain's nameservers and check they are in sync with each other.
Public DNS ServersDNS
Browse verified public DNS resolvers by country, with operator, ASN and response time.
Reverse DNS LookupDNS
Find the PTR (reverse DNS) record for an IP address and forward-confirm it.
Binary, Hex & Morse TranslatorDeveloper
Convert text to and from binary, hexadecimal, decimal and Morse code.
Hash & Base64 GeneratorDeveloper
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 hashes, or encode and decode Base64.
JSON Viewer, Beautifier & MinifierDeveloper
Validate, pretty-print or minify JSON, with the exact line and column of any syntax error.
ASN WHOIS LookupDomain
Look up the organisation, country and registration details behind an AS number or IP.
Domain DNS Health CheckerDomain
Full health report for a domain: nameservers, mail, SPF, DMARC, DNSSEC, CAA and expiry.
Domain WHOIS LookupDomain
Look up a domain's registrar, registration and expiry dates, nameservers and status codes.
Domain Blacklist CheckEmail
Check whether a sending domain or its mail servers appear on email blocklists.
Email Header AnalyzerEmail
Trace an email's delivery path, per-hop delays and SPF/DKIM/DMARC results. Runs in your browser.
MX LookupEmail
List a domain's mail servers in priority order and check for common MX misconfigurations.
SMTP TestEmail
Connects to an SMTP server, performs EHLO, and optionally STARTTLS.
HTTP
2IP
4IP Blacklist CheckIP
Checks common DNSBLs for an IP address.
IP Location LookupIP
Look up the country, region, city, network and ASN for an IP address.
IP WHOIS LookupIP
Fetch WHOIS/RDAP data for an IP address.
What is my IPIP
Shows your public IP address, how it was detected, and its network and location.
MAC Address GeneratorNetwork
Generate random locally-administered MAC addresses in colon, hyphen, dot or bare notation.
MAC Address LookupNetwork
Identify the manufacturer of a MAC address and decode its local, multicast and OUI flags.
Port CheckerNetwork
Check whether a common service port is open and reachable on a public host.
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