Search 184 million+ WHOIS records to find expiring domains. Filter by keyword, TLD, length, and age across 1,900+ TLDs — updated daily from RDAP data.
Written by Ishan Karunaratne · Last reviewed:
Expiring domains are registered domain names approaching the end of their registration period that the current owner has not renewed. When a domain's registration term ends, it enters a multi-phase expiry process governed by ICANN policies before becoming available for new registration. Domain investors and webmasters monitor expiring domains to acquire established names with existing authority, backlinks, and brand recognition at standard registration prices rather than premium aftermarket costs.
DNSChkr tracks over 184 million WHOIS records across 1,900+ top-level domains, refreshed daily via RDAP (Registration Data Access Protocol, defined in RFC 9082). This database enables keyword-based search, TLD filtering, and age-based discovery of domains entering the expiry window — from 1 day to 365 days before expiration.
When a domain registration expires and the owner does not renew, it passes through four phases before becoming available. Each phase has different costs, recovery options, and risks. The timeline below applies to generic top-level domains (gTLDs) under ICANN policy — country-code TLDs (ccTLDs) may differ.
| Phase | Duration | Recovery Cost | DNS Active | Who Can Act |
|---|---|---|---|---|
| Auto-Renewal Grace | 0-45 days | Standard renewal price | Yes | Current owner only |
| Redemption Grace | 30 days (ICANN mandate) | $80-200 + renewal | No | Current owner only |
| Pending Delete | Exactly 5 days | Not possible | No | Nobody |
| General Availability | Immediate | Standard registration ($8-15 for .com) | N/A | Anyone (first come, first served) |
Not all expiring domains are equal. The most valuable dropping domains share specific characteristics that indicate existing authority, brandability, or keyword relevance. Here are the key signals domain investors evaluate:
Older domains often carry more authority and backlinks. Search engines treat domain age as a trust signal, and a 10-year-old domain with clean history can provide immediate SEO advantage over a new registration.
Premium TLDs like .com, .net, and .org command the highest resale values. A .com domain is worth 5-10x more than the same name on a newer gTLD. Country-code TLDs can be valuable for geo-targeted businesses.
Short domains (3-6 characters) are increasingly rare and command premium prices. One-word .com domains routinely sell for $10,000-$500,000+ on the aftermarket. Use the length filter to target specific ranges.
Domains containing high-value keywords (e.g. 'solar', 'crypto', 'cloud') in growing industries are more brandable and SEO-friendly. Use keyword search with starts-with or contains mode to discover these.
The keyword search filters expiring domains by matching text within the domain label — the part of the domain name before the TLD. Three matching modes are available, each optimized for different discovery strategies:
Only alphanumeric characters and hyphens are matched, following DNS naming rules defined in RFC 1035. When a keyword is entered, domain length filters automatically adjust so the minimum cannot be less than the keyword length — searching for "solar" (5 characters) means the minimum is at least 5.
DNSChkr maintains a continuously updated database of over 184 million WHOIS records collected via RDAP (Registration Data Access Protocol), the structured successor to traditional WHOIS defined in RFC 9082 and RFC 9083. Expiry dates are extracted from the "events" array in RDAP responses where the eventAction is "expiration".
The data covers 1,900+ top-level domains and is refreshed daily through distributed RDAP workers that query registry and registrar servers. Each domain record includes the registration date, expiry date, registrar name, nameservers, and EPP status codes. This RDAP-based approach provides more structured and reliable data than parsing legacy WHOIS text responses, which vary in format between registrars and lack a standardized schema.
DNSChkr provides a suite of domain intelligence tools that complement expiring domain research. Use these together to evaluate domains before acquisition:
1–63 chars per RFC 1035