Root Servers.
Snapshot · 18 Sep 2026

Root Server Operators

12 independent organizations operate the 13 root server identities

Explore the organizations responsible for A through M, how the root identities map to operators, and the official resources published for each service.

Operator / Root Letter Matrix

Which organization operates each root server identity?
A
B
C
D
E
F
G
H
I
J
K
L
M
Verisign
USC-ISI
Cogent Communications
University of Maryland
NASA Ames
ISC
U.S. DoD NIC
U.S. Army Research Lab
Netnod
RIPE NCC
ICANN
WIDE Project

Operators (12)

Filter and sort locally · no backend
U

USC-ISI

Published

Operates root identity B
1 root identity

IPv4IPv6AnycastGlobal
isi.eduB-Root
C

Cogent Communications

Published

Operates root identity C
1 root identity

IPv4IPv6AnycastGlobal
cogentco.comC-Root
M

University of Maryland

Published

Operates root identity D
1 root identity

IPv4IPv6AnycastGlobal
umd.eduD-Root
N

NASA Ames

Published

Operates root identity E
1 root identity

IPv4IPv6AnycastGlobal
nasa.gov/amesE-Root
I

ISC

Published

Operates root identity F
1 root identity

IPv4IPv6AnycastGlobal
isc.orgF-Root
D

U.S. DoD NIC

Published

Operates root identity G
1 root identity

IPv4IPv6AnycastGlobal
G-Rootdefense.gov
A

U.S. Army Research Lab

Published

Operates root identity H
1 root identity

IPv4IPv6AnycastGlobal
H-Root
N

Netnod

Published

Operates root identity I
1 root identity

IPv4IPv6AnycastGlobal
netnod.seI-Root
R

RIPE NCC

Published

Operates root identity K
1 root identity

IPv4IPv6AnycastGlobal
ripe.netK-Root
I

ICANN

Published

Operates root identity L
1 root identity

IPv4IPv6AnycastGlobal
icann.orgL-Root
W

WIDE Project

Published

Operates root identity M
1 root identity

IPv4IPv6AnycastGlobal
wide.ad.jpM-Root
No operators match those filters.

A globally distributed, resilient system

The 12 operators collectively run the 13 named root server identities. Snapshot metrics shown here are static demo values and can be replaced by your authoritative data pipeline.

2,045Operational instances
13Root identities
12Operators