Domain name and DNS tools
Check whether a domain is available, look up WHOIS and DNS records, watch propagation and DNSSEC, convert international names and find look-alike domains.
- 12 tools
- 4 free · free previews of the rest
8 of 12 tools here need a pass: Pro unlocks 5, Premium 7, Ultimate all 8 · See passes
Go to the 12 toolsLooking into a domain name and the records behind it
For anyone choosing, buying, moving or defending a domain: a founder looking for a name, a site owner whose new record has not shown up yet, an IT team auditing a portfolio before renewals, and a security team watching for look-alike domains. The lookups ask public DNS resolvers and the registries themselves.
How to choose
Choose by what you want to know:
Can I get this name? Domain Availability Checker for many endings at once.
Who holds it, and until when? WHOIS Lookup (RDAP), Bulk WHOIS / RDAP Lookup, Domain Age & Expiry Checker and Domain Watchlist.
What do its records say? DNS Lookup, DNS Propagation Checker, Reverse DNS Lookup and DNSSEC Checker.
Is my zone file right? DNS Zone File Validator.
Names in other scripts, and look-alikes: Punycode Converter and Lookalike Domain Finder.
A new DNS record can take as long as its old TTL to be seen everywhere, so a propagation check soon after a change may still show the old answer in some places.
The main tools, compared
| Tool | When to pick it | What you give it | What you get | Works offline | Stays on your device |
|---|---|---|---|---|---|
| Domain Availability Checker | Asks DNS and the official registries whether a name is still unregistered, for many domain endings in one search. | URL, domain or IP | The full result | No | No |
| WHOIS Lookup (RDAP) | Fetches the registration record of a domain, an IP address or an AS number from the registry that holds it, over RDAP. | URL, domain or IP | The full result | No | No |
| Bulk WHOIS / RDAP Lookup (Domain Portfolio Audit) Premium tool | Audits a whole portfolio at once, listing each domain’s registrar, key dates and transfer locks in a table you can sort. | URL, domain or IP | Free preview: the summary counts of every domain, with the first half of the table (up to 10 rows) and its findings; a single domain is shown with its results hidden | No | No |
| Punycode Converter Pro tool | Converts international domain names to their xn-- form and back, naming the script of each label and warning about look-alikes. | URL, domain or IP | Free preview: every count and the verdict of each name that needs a look in full, with the first rows of the conversion table (up to 10) | Yes | Yes |
| Lookalike Domain Finder Ultimate tool | Builds the misspellings, swapped endings and confusable letters of your domain, then flags the variants that already resolve or are registered. | URL, domain or IP | Free preview: every lookalike checked and counted, with the first registered ones and their details (up to 10) | No | No |
| Reverse DNS Lookup Premium tool | Lists the PTR names of an IP address and confirms whether each name points back to the same address. | URL, domain or IP | Free preview: part of the real result’s rows; the full report and its exports open with a pass | No | No |
| DNSSEC Checker Pro tool | Compares the keys published at the parent with the zone’s signatures and their validity, and shows whether resolvers can authenticate it. | URL, domain or IP | Free preview: part of the real result’s rows; the full report and its exports open with a pass | No | No |
| Domain Age & Expiry Checker Pro tool | Reads the registry data of up to 25 names and gives each one’s registration age, renewal deadline and current holder. | URL, domain or IP | Free preview: the summary counts, with the first domains of the table (up to 10) in full; a single domain shows with its age, dates and registrar hidden | No | No |
Worked example: the DNS form of münchen.de
A company wants to use the German city name münchen.de in a link and in its certificate, both of which need the ASCII form of the name.
The name has two labels, münchen and de, and only the first contains a character outside ASCII, the ü.
Punycode keeps the ASCII letters of that label, mnchen, and encodes the ü and its position as the suffix 3ya.
With the xn-- prefix that marks an encoded label, the name becomes xn--mnchen-3ya.de, the form DNS and certificates use.
The converter reports that every letter is Latin and that the name resembles munchen, so it is not a mix of scripts made to deceive.
Questions
Why does my new DNS record show in some places and not others?
Resolvers keep an answer for as long as its TTL allows, so until those copies expire they still give the old record. The propagation checker asks several public resolvers at once.
What is RDAP?
The registries’ modern replacement for WHOIS, which returns registration data in a structured form. The WHOIS lookup uses it and reads the answer from the registry that holds the name.
Can someone register a domain that looks like mine?
Yes, with a typo, another ending or letters from another script that look the same. The look-alike finder lists such variants and flags the ones already taken.
Does an available result mean I can buy the name?
It means the registries show no registration now; the name still has to be bought from a registrar, and premium or reserved names may cost more or be withheld.
Start with these
- Reverse DNS Lookup Free preview: part of the real result’s rows; the full report and its exports open with a pass
- DNS Lookup Every DNS record type, straight from a public DNS resolver, explained in plain words.
- DNS Propagation Checker Is your new DNS record visible yet? Compare public resolvers and locations at once.
More tools here
- WHOIS Lookup (RDAP) Registration data for any domain, IP address or AS number, from the official registry.
- Domain Availability Checker Is the name free? Ask DNS and the official registries for many TLDs at once.
- Punycode Converter Unicode domains to xn-- and back, with the script of every label and look-alike warnings.
- Lookalike Domain Finder See which typo and look-alike versions of your domain someone has registered.
- DNSSEC Checker Compare delegation keys and signature windows with the resolver’s authentication result.
- Domain Age & Expiry Checker How old each domain is, when it expires and who holds it — up to 25 at once.
- Domain Watchlist Keep the domain names you want, with their expiry dates and what changed.
- Bulk WHOIS / RDAP Lookup (Domain Portfolio Audit) Registrar, dates and locks of every domain in a portfolio — in one sortable table.
- DNS Zone File Validator Paste or open a zone file and see every syntax error and zone problem, line by line.
Lessons on this
All 12 tools
Every tool here by name, grouped by what it is for.
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Domain name search, WHOIS and expiry dates
5 toolsDNS records, propagation and DNSSEC
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Inside this hub
Good to know
- 2 of 12 tools run entirely in your browser; the other 10 explain on their pages what they send.
- 2 of 12 keep working without a connection once loaded.
What a pass opens here
5 Pro tools, 2 Premium tools and 1 Ultimate tool here need a pass. 4 tools here are free in full.
- Pro pass opens 5 of 8 ₹179 / $5.99 for 30 days
- Premium pass opens 7 of 8 ₹799 / $19.99 for 30 days
- Ultimate pass opens all 8 ₹1,199 / $24.99 for 30 days