Root Servers.
Snapshot · 18 Sep 2026

C-Root

Operational
c.root-servers.net

One of the 13 named authorities configured for the DNS root zone.

AS2149AnycastIPv4 + IPv6DNS RootCogent

What C-Root is

C-Root is the root server identity c.root-servers.net. It is one of the 13 named authorities for the DNS root zone, is operated by Cogent Communications, and is served from multiple published locations using the same root-service addresses.

Global servicePublished sites across multiple regions
Root authorityAnswers authoritative queries for the root zone
Anycast deliveryOne service identity announced from many sites

Network & Service

Hostname
c.root-servers.net
IPv4
192.33.4.12
IPv6
2001:500:2::c
ASN
AS2149
Operator
Cogent Communications
Transport
DNS over UDP / TCP · port 53
Address families
IPv4 and IPv6

Deployment Snapshot

13Published sitesroot-servers.org
13Operationalcurrent snapshot
0Suspendedcurrent snapshot
0Decommissionedcurrent snapshot

Global Anycast Service

Same root-service addresses, published from multiple network sites.

C-Root
FrankfurtLos AngelesTokyo
C-Root192.33.4.122001:500:2::c
New YorkSingapore+ more sites

Published Locations

All published C-Root sites from the operator-published dataset.

View All Locations
LocationSite typeIPv4IPv6Instances
Bratislava, SKGlobalEnabledEnabled1
Chicago, USGlobalEnabledEnabled1
Frankfurt, DEGlobalEnabledEnabled1
Los Angeles, USGlobalEnabledEnabled1
Madrid, ESGlobalEnabledEnabled1
New York, USGlobalEnabledEnabled1
Paris, FRGlobalEnabledEnabled1
Queretaro, MXGlobalEnabledEnabled1
Rio de Janeiro, BRGlobalEnabledEnabled1
Singapore, SGGlobalEnabledEnabled1
Sydney, AUGlobalEnabledEnabled1
Tokyo, JPGlobalEnabledEnabled1
Washington DC, USGlobalEnabledEnabled1