What Is My DNS Resolver

Find which recursive DNS resolver your network actually uses: the server that queries on your behalf, often different from "your IP". Robtex also shows EDNS Client Subnet when the resolver forwards it. This is the DNS analogue of "what is my IP", and Robtex is one of the few places that shows it.

From the command line

Echo your resolver's IP, using whichever family the resolver used to reach Robtex.

dig dnsip.robtex.com

Force IPv4 resolver reachability.

dig dnsipv4.robtex.com

Force IPv6 resolver reachability.

dig dnsipv6.robtex.com

Ask for enriched TXT output:resolver=,resolver-ptr=,resolver-asn=,edns-udp-size=,do=, andecs=/ecs-asn=when present.

dig TXT dnsip.robtex.com

Query through Google Public DNS over IPv4. Google forwards a /24 of your address asecs=.

dig @8.8.8.8 dnsip.robtex.com TXT

Query over IPv6 through Google. For IPv6 the resolver forwards a /56 prefix asecs=.

dig dnsipv6.robtex.com TXT @2001:4860:4860::8888

Inject an EDNS Client Subnet directly and see it echoed and enriched.

dig +subnet=8.8.8.0/24 dnsip.robtex.com TXT @46.255.120.53

EDNS Client Subnet

resolver=is the recursive DNS server that contacted Robtex.ecs=is the client subnet that resolver chose to forward. Google Public DNS (8.8.8.8) forwards a /24 of your IPv4 address, or a /56 of your IPv6; Cloudflare (1.1.1.1) sends none for privacy, soecs=appears only with resolvers that send ECS. See the full list of Public DNS Resolvers.

How it works

dnsip.robtex.com,dnsipv4.robtex.com, anddnsipv6.robtex.comare delegated to Robtex's anycast nameserver, which echoes the source IP of the querying resolver. The v4 and v6 variants are enforced by single-family delegation glue.

What to check next

Compare this with What Is My IP to see whether your HTTP source address and recursive DNS resolver are different. Use DNS Lookup or Robtex DNS Lookup for record checks, Historical DNS Records for passive DNS timelines, and AS Number Lookup for the resolver's network.

FAQ

What is a DNS resolver?
A recursive DNS resolver is the server your device, router, VPN, or ISP asks to look up names. It contacts authoritative DNS servers and returns the answer to you.
What is EDNS Client Subnet?
EDNS Client Subnet is an optional DNS extension where a resolver forwards part of the client's address, such as a /24, so authoritative DNS can make location-aware answers.
Why is my resolver IP different from my IP?
Your web traffic and DNS traffic can leave through different systems. Common causes are ISP resolvers, router DNS settings, VPNs, enterprise DNS, browser secure DNS, and public resolvers such as Google or Cloudflare.
What does dnsipv4 vs dnsipv6 do?
dnsipv4.robtex.comonly has IPv4 delegation glue anddnsipv6.robtex.comonly has IPv6 delegation glue, so they show which address family your resolver can use toward Robtex.