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To monitor domain availability, first decide whether you mean a domain you already own or a name you hope to register. For an owned domain, track its expiration date, keep your registrar contact and payment details current, and enable auto-renewal if it suits you. To watch a wanted name, use ICANN’s RDAP lookup for manual checks or its open-source RDAP command-line client for repeatable checks. Expiration does not mean a domain is immediately available: a typical gTLD may pass through a redemption period and PendingDelete before release.
How do I monitor domain availability?
There are two distinct monitoring jobs:
- Protect a domain you own: prevent an accidental lapse by tracking its renewal date, receiving registrar reminders, and considering auto-renewal.
- Watch a domain you want: check its registration data for changes and verify its status with the authoritative registry or registrar before trying to register it.
For a one-time check, use ICANN Lookup. For repeatable checks, ICANN provides an open-source RDAP command-line client that can be used in scripts. Its documentation does not prescribe an alert interval or guarantee notifications, so you need to decide how often to check and how to deliver any alerts.
What RDAP tells you—and how it differs from WHOIS
RDAP, the Registration Data Access Protocol, is the standardized successor to WHOIS for registration-data access. It supports internationalized data, secure access, standardized responses, and discovery of authoritative servers. ICANN says gTLD registries and registrars have been required to provide RDAP under the gTLD RDAP Profile since 28 January 2025; they are generally no longer required to provide WHOIS, with exceptions for .com, .name, and .post. ICANN Lookup can fall back to WHOIS when relevant RDAP information is unavailable. For current checks, start with RDAP rather than relying on a WHOIS-only instruction. ICANN’s RDAP guidance is specifically about gTLDs; confirm the appropriate authoritative lookup service for a country-code TLD or another namespace.
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ICANN estimated more than 10 billion RDAP queries per month across all types of RDAP servers in December 2024. That is an ecosystem-use estimate, not a measure of any particular monitoring tool’s speed or accuracy. ICANN RDAP guidance
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How do I know when my domain expires?
- Look up the registration. Search the name in ICANN Lookup to view publicly available registration data and identify the registrar. The lookup queries registry or registrar RDAP data in real time, with WHOIS fallback if relevant RDAP data is unavailable.
- Record the expiration date and registrar. ICANN advises registrants to keep track of the expiration date and contact their registrar if they are unsure.
- Check that reminders can reach you. ICANN policy requires registrars to send two renewal reminders approximately one month and one week before expiration. Keep the email address and other contact details on the registrar account current so the notices are deliverable.
- Review auto-renewal and payment details. Most registrars offer auto-renewal, but availability, renewal prices, and fees vary. If you enable it, keep the payment method current and check the registrar’s terms.
- Add an independent reminder. Record the date in a calendar or team system as a backup to registrar notices. The registrar remains the source for your account’s renewal options and charges.
ICANN’s renewal and expiration guidance covers reminders, renewal, and recovery: Renewing and Expiring Domain Names.
How can I script repeatable registration-data checks?
ICANN’s open-source RDAP command-line client can be used for scripting. Install and invoke it using the instructions in the ICANN RDAP client repository. A monitoring script can query a list of names on a schedule, save the returned data, compare each result with the previous check, and notify an operator when relevant fields change.
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Choose the fields you care about—such as registration status or expiration data—and preserve the date and response for each check. A changed registration record is a signal to investigate, not proof that a name can be registered immediately. Set a reasonable checking interval for your use case; ICANN’s client documentation does not specify a recommended cadence or promise alert delivery. Respect applicable service limits and terms, and verify a prospective registration through the registrar or registry before acting.
When does an expired domain become available?
Expiration is not the same as release. In the typical gTLD lifecycle described by ICANN, a deleted domain can be restored during a 30-day Redemption Grace Period. If it is not restored, it enters PendingDelete for five days; after that, it is released first-come, first-served. These durations describe the typical gTLD process, not every TLD or registrar scenario. Registrar handling and terms can vary, so verify the specific domain with its registrar and registry data rather than treating the expiration date as a guaranteed drop time. ICANN’s renewal and expiration FAQ
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Choose the right monitoring approach
| Need | Useful approach | What to keep in mind |
|---|---|---|
| Check a name once | ICANN Lookup in a browser | It shows publicly available registration data; status is not a guarantee of immediate registrability. |
| Track a list of names repeatedly | ICANN’s open-source RDAP command-line client and a scheduled script | You must choose the schedule, detect changes, and arrange notifications; the client documentation does not guarantee alerts. |
| Avoid losing a name you already own | Registrar reminders, current account details, calendar backup, and possibly auto-renewal | Renewal options, prices, fees, and recovery handling differ by registrar. |
| Track a country-code domain | The relevant authoritative registry or registrar lookup | Do not assume gTLD RDAP requirements or lifecycle timings apply identically to every ccTLD. |
Troubleshooting common monitoring problems
- The lookup does not show the detail you expected: registration data is publicly available only to the extent provided for that domain. ICANN Lookup may fall back to WHOIS if relevant RDAP information is unavailable; consult the sponsoring registrar or the appropriate registry for the authoritative next step.
- A domain is expired but still cannot be registered: it may remain in a recovery or deletion stage. Check its current status and the registrar or registry’s handling; expiration alone does not establish availability.
- You did not receive an expiration reminder: confirm the registrar account’s contact information and reminder settings. Do not rely on a missed email as evidence that renewal is unnecessary.
- Auto-renewal did not complete: review the registrar account’s renewal status, payment method, and terms, then contact the registrar promptly. Recovery options and charges vary.
- Your script reports a change but the name still appears registered: compare the actual RDAP fields and query again. A record change can indicate a lifecycle transition rather than open registration; verify with the registrar or registry before attempting a purchase.
Or skip the browser setup
For the screenshot part of an automated workflow, ScreenshotNeo can return a webpage screenshot with one GET request. It is a screenshot API, not a domain-registration monitor: use RDAP for registration status and use a screenshot when you also need a visual record of a lookup page.
cURL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://lookup.icann.org/ -o shot.webpSee the ScreenshotNeo API documentation for options and response details. Cookie and consent banners, newsletter popups, and chat widgets are removed before the screenshot; each cleanup step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing status. ScreenshotNeo also has an MCP server with tools for AI agents to take screenshots, get page information, and capture PDFs. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 shots.
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Frequently Asked Questions
Does ICANN Lookup cost anything?
ICANN describes its browser RDAP client as free to use.
Does checking a domain’s RDAP record reserve it for me?
No. A lookup observes registration data; it does not reserve a name or guarantee that it will be available when you try to register it.
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