Name: DNS Resolver IP
Creator: InternetData

Every host answering DNS on UDP port 53, flagged for recursion and whether it is a working open resolver.

Overview

Every host answering DNS on UDP port 53, flagged for recursion and whether it is a working open resolver.

Formats

curl -L -o dns_resolver_ip_v1.csv.gz -X GET "https://internetdata.io/api/v2/database/download?id=dns_resolver_ip_v1&format=csvgz&apikey=$APIKEY"

Schema

Name	Type	Description
`ip`	`ipaddress`	The IP address, IPv4 or IPv6, that returned a valid DNS reply on UDP port 53.
`port`	`integer`	The UDP port scanned (53).
`recursion_available`	`boolean`	The RA bit in the reply: whether the server advertises recursion.
`rcode`	`integer`	The DNS response code (0 = NOERROR, 5 = REFUSED, ...), which separates a true open resolver from one that advertises recursion but refuses off-net queries.
`answer_correct`	`boolean`	True if a recursive query for our own hostname returned our address: a working open recursive resolver with no DNS manipulation.
`first_seen`	`date`	The first day in the 90-day window the host replied.
`last_seen`	`date`	The most recent day the host replied.

Samples

ip	port	recursion_available	rcode	answer_correct	first_seen	last_seen
`201.133.193.11`	`53`	`true`	`0`	`true`	`2026-09-18`	`2026-09-18`
`190.74.17.157`	`53`	`true`	`0`	`true`	`2026-07-14`	`2026-07-14`
`105.158.127.125`	`53`	`true`	`0`	`true`	`2026-09-23`	`2026-09-23`
`5.236.23.162`	`53`	`true`	`0`	`true`	`2026-07-31`	`2026-09-27`
`2.183.104.169`	`53`	`true`	`0`	`true`	`2026-09-02`	`2026-09-02`