Root Servers.
Snapshot · 18 Sep 2026

B-Root

Operational
b.root-servers.net

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

AS394353AnycastIPv4 + IPv6DNS RootUSC-ISI

What B-Root is

B-Root is the root server identity b.root-servers.net. It is one of the 13 named authorities for the DNS root zone, is operated by the Information Sciences Institute (USC-ISI), 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
b.root-servers.net
IPv4
170.247.170.2
IPv6
2801:1b8:10::b
ASN
AS394353
Operator
Information Sciences Institute (USC-ISI)
Transport
DNS over UDP / TCP · port 53
Address families
IPv4 and IPv6

Deployment Snapshot

6Published sitesroot-servers.org
6Operationalcurrent snapshot
0Suspendedcurrent snapshot
0Decommissionedcurrent snapshot

Global Anycast Service

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

B-Root
FrankfurtLos AngelesMiami
B-Root170.247.170.22801:1b8:10::b
RestonSantiagoSingapore

Published Locations

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

View All Locations
LocationSite typeIPv4IPv6Instances
Frankfurt, DEGlobalEnabledEnabled1
Los Angeles, USGlobalEnabledEnabled1
Miami, USGlobalEnabledEnabled1
Reston, USGlobalEnabledEnabled1
Santiago, CLGlobalEnabledEnabled1
Singapore, SGGlobalEnabledEnabled1