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DNS / Domain

DNS records, domain status, delegation and propagation checks.

These DNS and domain tools let you quickly see where a domain actually points, whether its mail and web settings are correct, and what its registration and expiry details are — all in one place. They cover DNS record lookups (A, AAAA, MX, TXT, NS, CNAME, SOA), DNS propagation checks, reverse DNS (PTR) lookups, WHOIS/RDAP domain information, and nameserver and domain status checks. That makes them handy for developers launching a new site, admins transferring or renewing domains, marketers chasing down email-deliverability issues, and anyone who keeps hearing "the DNS hasn't updated yet."

A typical workflow starts with a DNS record lookup to confirm which IP, mail server, and nameservers a domain currently uses. If you've just made a change, follow up with a propagation check to compare the new value across public resolvers worldwide. Use WHOIS/RDAP and the status-code decoder when you need ownership, expiry, or lock-state details, and a reverse DNS (PTR) lookup when a mail server or IP needs proper rDNS. Before switching nameservers or moving hosts, run through a DNS change checklist so TTL, MX, and subdomain impacts are caught in advance — that's the single best way to avoid downtime.

Domain Status Code Decoder
Explain EPP domain status codes like clientTransferProhibited.
DNS Change Impact Checklist
Check risks before changing NS, MX or TXT records.
Typosquatting Domain Generator
Generate look-alike and typo domains for phishing/brand protection.
DNS Record Lookup
Look up A, AAAA, MX, TXT, NS, CNAME and SOA records for a domain.
DNS Propagation Check
Compare a record across multiple public resolvers to check propagation.
Reverse DNS (PTR) Lookup
Look up the hostname (PTR record) for an IP address.
WHOIS / Domain Lookup
Look up a domain's registrar, dates and status via RDAP.
Nameserver (NS) Check
Look up a domain's nameservers and check their consistency.
DNSSEC Checker
Check whether a domain has DNSSEC (DS/DNSKEY) enabled.

Frequently asked questions

How long does a DNS change take to apply?
It depends on the record's TTL (Time To Live). With a TTL of 3600 seconds, resolvers that already cached the old value can keep it for up to an hour, so most changes show up within minutes to tens of minutes, but full global propagation is usually quoted as 24–48 hours. If you know a change is coming, lower the TTL (e.g., to 300 seconds) beforehand to speed up the switch. Use a DNS propagation checker to compare resolvers and see the real state.
What's the difference between WHOIS and RDAP?
Both let you look up a domain's registration details — registrar, creation/expiry dates, status, and so on. WHOIS is the older text-based protocol, while RDAP is the modern replacement that returns structured JSON with a consistent format and access controls. Most gTLDs now offer RDAP officially, and the domain lookup on this site uses RDAP.
Why does reverse DNS (PTR) matter?
A PTR record maps an IP address back to a hostname, and it's especially important for mail servers. Many receiving servers will treat mail as suspicious or reject it if the sending IP has no PTR record, or if the PTR doesn't match the forward (A) record. If you run your own mail server, make sure the forward and reverse records line up so your deliverability stays stable.
Do these tools send my input anywhere?
Tools that genuinely need an external server — DNS lookups, propagation checks, WHOIS — send the domain or IP you enter to public DNS resolvers or RDAP servers in order to query them. That's inherent to how those features work, and the data isn't stored or shared beyond the lookup. Client-only tools like calculators and converters run entirely in your browser and never transmit anything.
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