example.com
Status description goes here.
Domain Whois Lookup
Professional-grade Domain Availability & DNS Diagnostic tool. Features deep TLD analysis, DNS-over-HTTPS (DoH) record verification, and massive registry database.
Supported: gTLDs (.com, .net), ccTLDs (.uk, .de), newTLDs (.tech, .xyz)
About
This is not a standard domain checker. It is a Client-Side DNS Diagnostic Console designed for network engineers, developers, and webmasters who demand precision over approximation. Unlike generic tools that rely on cached database snapshots, this utility executes real-time queries using DNS-over-HTTPS (DoH) protocols, communicating directly with authoritative resolvers (Google/Cloudflare) to determine the exact state of a namespace.
We solve the Black Box Problem of domain registration. When a domain is purchased but inactive, or when DNS propagation fails, standard checkers simply say "Taken." This tool analyzes the specific RCODE (Response Code) and RRSet (Resource Record Set) to distinguish between a domain that is Registered, Reserved, Active, or truly Available (NXDOMAIN). It includes a local database of over 400 TLDs to provide registry constraints and ownership metadata instantly.
whois lookup
dns propagation
domain availability
ns records
mx lookup
network tools
Formulas
To understand the reliability of the lookup, one must consider the Propagation Latency. The maximum time t a stale record persists in global caches is determined by the Time-To-Live (TTL) set by the authoritative server:
{
texpire = tfetch + TTLLatency ∝ max(TTL, SOA_MIN)
We determine availability based on the IETF RFC 1035 response codes:
Status =
{
AVAILABLE if RCODE ≡ 3 (NXDOMAIN)TAKEN if RCODE ≡ 0 (NOERROR)ERROR if RCODE ≡ 2 (SERVFAIL)
Reference Data
| Record | Protocol ID | Diagnostic Function | Typical TTL (Seconds) |
|---|---|---|---|
| SOA | 6 | Start of Authority. The primary fingerprint of a zone. Contains the serial number n used to version-control DNS changes. | 3600 (1h) - 86400 (24h) |
| NS | 2 | Name Server. Defines the servers authoritative for the domain. Absence of NS often indicates a "Parked" or "Redemption" status. | 86400 (24h) |
| A / AAAA | 1 / 28 | Address Mapping. Connects hostname to IPv4/IPv6. Essential for HTTP/Web functionality. | 300 (5m) - 3600 (1h) |
| MX | 15 | Mail Exchange. Directs email. Priority integers i determine the order of delivery attempts. | 14400 (4h) |
| TXT | 16 | Text / Verification. Critical for security frameworks (SPF, DKIM, DMARC) and ownership proof (Google/Facebook site verify). | 300 (5m) |
| CNAME | 5 | Canonical Name. Maps an alias to a true domain name. Cannot coexist with other records at the root level (Apex). | 3600 (1h) |
Frequently Asked Questions
This is a common scenario known as "DNS Parking" or "Lame Delegation". A "NOERROR" status (RCODE 0) simply means the domain is registered in the TLD database. However, if there are no "A" records (IPv4) associated with it, or if the server is offline, the website will not load. This tool confirms the legal ownership exists, even if the functional website does not.
Yes. This tool runs entirely on the Client-Side (in your browser). We do not log your queries on any backend server. Furthermore, modern Whois protocols (RDAP) automatically redact Personal Identifiable Information (PII) like names and phone numbers to comply with GDPR, showing "REDACTED FOR PRIVACY" instead.
Standard DNS queries are sent over UDP/TCP port 53 in plain text, which can be intercepted or spoofed. DoH (DNS-over-HTTPS) encrypts the query inside a secure HTTP packet (port 443). This tool uses DoH API endpoints (Google/Cloudflare) to bypass local ISP caching and get the most up-to-date "Authoritative" answer possible.
Absolutely. Our internal database supports metadata for over 400 TLDs. However, some country-code TLDs (ccTLDs) have strict registry restrictions (e.g., requiring local residency). While we can check availability technically, you should verify legal eligibility with the specific registrar.
The Start of Authority (SOA) Serial is a version number for the domain's DNS zone. It typically follows the format YYYYMMDDnn. If you change a DNS record and the Serial increases, it signals to the rest of the internet that the zone has been updated and caches should be refreshed.