How to use
- Enter a domain (pasting a full URL works too). The record type defaults to All common, which lists A, AAAA, CNAME, MX, TXT and NS at once; pick a single type when you only need one — A for websites, MX for email, TXT for verification.
- Choose a DNS server; right after a change, choose All servers (compare).
- Click Look up to see each record’s value and TTL.
Options explained
- Record types
- A/AAAA are IPv4/IPv6 addresses, CNAME an alias, MX mail servers, TXT is used for SPF and verification, NS the authoritative servers, CAA which authorities may issue certificates.
- TTL
- How many seconds a record may be cached. After a change, old answers can linger for up to the TTL.
- Reverse lookup
- Choose PTR and enter an IP address to find its host name.
Record types and where they are defined
| Type | Holds | Defined in |
|---|---|---|
| A | IPv4 address | RFC 1035 |
| AAAA | IPv6 address | RFC 3596 |
| CNAME | Alias to another name | RFC 1035 |
| MX | Mail server and its priority (lower is tried first) | RFC 1035 |
| TXT | Free text, used for SPF, DKIM and site verification | RFC 1035 |
| NS | Authoritative name servers for the zone | RFC 1035 |
| SOA | Zone start of authority: primary server, serial, timers | RFC 1035 |
| CAA | Which certificate authorities may issue certificates | RFC 8659 |
| PTR | Host name for an address (reverse lookup) | RFC 1035 |
| SRV | Host and port of a service | RFC 2782 |
A reverse lookup asks for the PTR record of the address written backwards under in-addr.arpa. For example, 192.0.2.10 is looked up as 10.2.0.192.in-addr.arpa.
A name that has a CNAME cannot have other records of its own, which is why a CNAME is not allowed at the zone apex, where NS and SOA records must exist.
Frequently asked questions
Why hasn’t my DNS change shown up yet?
Resolvers cache old answers until their TTL expires. All servers (compare) shows which resolvers already see the new record.
Why do results differ from my computer?
Your computer may use your provider’s DNS, a proxy or a hosts file. These results come straight from the chosen public resolver.
Are internationalized domains supported?
Yes. They are converted to Punycode (starting with xn--) before the query.
Privacy
This tool needs our server: what you enter or upload is sent over HTTPS, processed and then discarded, never stored. Server access logs record IP addresses and request URLs, used only to prevent abuse.