DNS lookup
Look up DNS records
See the A, MX, TXT and other records any domain publishes.
| Type | Value | TTL |
|---|
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What DNS records are
DNS is the internet's address book. A domain owner publishes records that say where the website lives, which servers take its email and which services it uses. Anyone can read them, and your device reads them every time you open a site. Each record has a TTL, the number of seconds other servers may cache it.
- A
- Points a name to an IPv4 address.
- AAAA
- Points a name to an IPv6 address.
- CNAME
- Makes a name an alias of another name, which is looked up in its place.
- MX
- Names the mail servers that accept email for the domain, with a priority number. Lower is tried first.
- TXT
- Free-form text. Used for SPF, DKIM and DMARC email checks and for proving domain ownership.
- NS
- Lists the name servers that are authoritative for the domain.
- SOA
- Start of authority: the primary name server, the admin contact, a serial number and timing values.
- SRV
- Points a service, such as _sip._tcp, to a host and port, with priority and weight.
Frequently asked questions
A DNS lookup asks the Domain Name System what records a domain publishes, such as the IP address a name points to or the servers that receive its email. Your device does this every time you open a site. This tool shows you the answers directly.
An MX (mail exchange) record names a server that accepts email for a domain. Each has a priority number, and senders try the lowest number first. A domain with no MX records usually cannot receive email.
TXT records hold text that other systems read. The most common uses are email authentication (SPF, DKIM and DMARC) and verification codes that prove to a service, such as a search console or email provider, that you control the domain.
Resolvers cache each answer for as long as its TTL (time to live) says, in seconds. Until that time runs out, some resolvers keep serving the old value. This is usually called propagation. Lowering the TTL a day before a change makes the switch faster.
NXDOMAIN means the domain name doesn't exist in DNS. Either it was mistyped, it was never registered, or the subdomain was never created. It is an answer, not an outage.
Yes. DNS is public by design: every record here is published so that any computer on the internet can find it. Looking up records is how the internet normally works.