How do I find out how old a domain is?

Look up its registration date in the registry's RDAP (or WHOIS) record. Enter the domain above and the checker reads the registration, expiry and last-changed dates from the registry's RDAP server and works out the age.

Why does it say it couldn't determine the age?

Either the TLD's registry publishes no RDAP service (true of .io, .co, .de and several other country codes as of October 2026), or the registry returned no record or didn't answer. We say so rather than guess. If the domain has nameservers in DNS, it is registered even when RDAP is silent.

Is domain age the same as website age?

No. Domain age is when the name was registered. A website may have gone live years later, or the domain may have had several unrelated sites; registries don't record either. Web archives such as the Wayback Machine show when pages were first captured.

Can I see when a domain expires?

Yes, where the registry publishes it. The expiry date comes from the same RDAP record as the registration date and is shown for each domain, along with the last time the record changed.

Does the registration date reset when a domain changes owner?

Usually not. A transfer between registrars keeps the original registration date. But if a domain expires, is deleted and is registered again, the registry records a new registration date, so an old name can show as young.

Is RDAP the same as WHOIS?

It holds the same registration data in a structured JSON format over HTTPS, with standard error codes and links between registries and registrars. ICANN requires RDAP of every generic-TLD registry and registrar, and since 28 January 2025 no longer requires them to run WHOIS. Many country-code registries still run WHOIS only.

Can I check domain age in bulk?

Yes. This page takes up to ten domains per lookup, ten a minute from one connection. For a longer list or a CSV, the bulk domain age checker runs up to 500 unique domains at once, with a sortable table, age filters and a CSV download.

Domain age checker: when was this domain registered?

A domain age checker tells you when a domain was registered and how old it is. Enter up to 10 domains, email addresses or URLs and press Check domain age: each registry's own RDAP server, the successor to WHOIS, is asked for the registration date, expiry date and registrar. Where a registry publishes no RDAP (.io, .co and .de among them), the result says the age couldn't be determined rather than guess.

Have a list? Check them all at once

SimpleAPI

Sample result

acme.example was registered in August 1995, over 31 years ago.

Domain: acme.example
Registered: 14 Aug 1995
Age: 11,389 days

What this means for you

An old domain is a good sign a company is established; a days-old one deserves a closer look.

Next step:See who hosts their email

Registration, expiry and last-updated dates
Age in whole days at lookup time
Registrar, EPP status flags and DNSSEC
Straight from the TLD's own registry

RDAP
WHOIS
Registrar

By SimpleVerifier Team · Last updated October 19, 2026

Run 55 times this week

How do I check the age of a domain?

Enter a domain, an email address or a website URL. Up to 10, one per line.
Press Check domain age. Each name is looked up on its TLD's registry, found through IANA's RDAP bootstrap list.
Read the age, registration date, expiry, last change and registrar for each domain.
Download the table as CSV if you checked several. For a longer list, use the bulk domain age checker.

Example

You enter: The domain acme.example. Up to 10 domains, addresses or URLs, one per line.
You get: Record found: registered 14 August 1995, 31 years old (11,389 days on 19 October 2026), expiring 13 August 2027, registrar Example Registrar, Inc., DNSSEC signed. A TLD without RDAP says the age couldn't be determined instead of guessing.
Limits: Up to 10 domains a run and 10 runs a minute per connection. No account needed.

Does a domain age checker use WHOIS or RDAP?

This one uses RDAP, which holds the same registration data as WHOIS in a structured form, read straight from the registry. Every TLD has one registry, and the registry keeps the registration record. RDAP (Registration Data Access Protocol) is the JSON replacement for WHOIS, and IANA publishes a bootstrap file listing each TLD's RDAP server, as defined in RFC 9224. ICANN requires every generic-TLD registry and registrar (.com, .net, .org and the rest) to run RDAP, and since 28 January 2025 they no longer have to run WHOIS at all (ICANN).

The checker reads the registration, expiration and last changed events from the registry's answer, and the registrar's name. Nothing is scraped from WHOIS and nothing is sent to the domain itself. A subdomain such as mail.acme.co.uk is looked up as the registered name, acme.co.uk.

Why can't it find the age of some domains?

Because not every country-code registry runs RDAP. On 16 October 2026, IANA's bootstrap file listed RDAP servers for 1,203 TLDs, but not for .io, .co, .de, .me, .us, .jp or .cn, among others. Public redirectors answer "not found" for registered names under those TLDs, so a tool built on them would wrongly call google.io unregistered. We don't use them. When a registry has no RDAP, or returns no record, the result says so, and adds whether the domain has nameservers in DNS: a domain with nameservers is registered, whatever RDAP says.

A registry's "not found" is also not proof a name is free. Registries reserve and block names, and some answer differently for privacy reasons. To check availability, ask a registrar.

Why does domain age matter for email?

A new domain has no sending reputation, and a days-old domain on a signup form is worth a second look. For a sender, Google's sender guidelines ask new senders to start with low volume to engaged recipients and increase slowly, so plan a warm-up before any campaign; our warm-up calculator builds the schedule. Bounces hurt most at this stage, because there is no history to absorb them.

For a signup form or a lead list, a domain registered last week isn't proof of anything: real companies register new domains every day. But throwaway domains used for fake signups are usually new, so age is a useful signal next to a disposable email check and a mailbox check.

What is the difference between RDAP and WHOIS?

	RDAP	WHOIS
Format	Structured JSON	Free text, different for each registry
Transport	HTTPS	Plain text on port 43
Finding the right server	IANA bootstrap file	Lists maintained by each tool
Required for generic TLDs	Yes	No, since 28 January 2025
Country-code TLDs	Some	Most

Who uses this tool, and for what?

SaaS signups: Look up the domains behind suspicious signups. A domain registered days ago, with no website and a disposable pattern, is a common sign of trial abuse.
Cold emailers: Check how old a newly bought sending domain really is before warm-up, and note its expiry date so it doesn't lapse mid-campaign.
Sales ops: Spot-check leads from a list: a prospect whose company domain was registered last month may be a new business, or a bad record.
Agencies: Pull registration, expiry and registrar for a client's domains in one table, so renewals and transfers don't get missed.

What can’t this tool tell you?

Country-code TLDs without RDAP, including .io, .co and .de, return no age. The result says so instead of guessing.
A domain that expired and was registered again shows its newest registration date, not its first.
It shows the current record only. There is no ownership history.
A "not found" from a registry doesn't mean the name is available to buy. Ask a registrar.

Common questions

How do I find out how old a domain is?: Look up its registration date in the registry's RDAP (or WHOIS) record. Enter the domain above and the checker reads the registration, expiry and last-changed dates from the registry's RDAP server and works out the age.
Why does it say it couldn't determine the age?: Either the TLD's registry publishes no RDAP service (true of .io, .co, .de and several other country codes as of October 2026), or the registry returned no record or didn't answer. We say so rather than guess. If the domain has nameservers in DNS, it is registered even when RDAP is silent.
Is domain age the same as website age?: No. Domain age is when the name was registered. A website may have gone live years later, or the domain may have had several unrelated sites; registries don't record either. Web archives such as the Wayback Machine show when pages were first captured.
Can I see when a domain expires?: Yes, where the registry publishes it. The expiry date comes from the same RDAP record as the registration date and is shown for each domain, along with the last time the record changed.
Does the registration date reset when a domain changes owner?: Usually not. A transfer between registrars keeps the original registration date. But if a domain expires, is deleted and is registered again, the registry records a new registration date, so an old name can show as young.
Is RDAP the same as WHOIS?: It holds the same registration data in a structured JSON format over HTTPS, with standard error codes and links between registries and registrars. ICANN requires RDAP of every generic-TLD registry and registrar, and since 28 January 2025 no longer requires them to run WHOIS. Many country-code registries still run WHOIS only.
Can I check domain age in bulk?: Yes. This page takes up to ten domains per lookup, ten a minute from one connection. For a longer list or a CSV, the bulk domain age checker runs up to 500 unique domains at once, with a sortable table, age filters and a CSV download.

Sources

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