subnet.im

AS6421TATA COMMUNICATIONS (AMERICA) INC

United StatesRegistryARIN

As of 27th September 2026, AS6421 (TATA COMMUNICATIONS (AMERICA) INC), a network registered in the United States with ARIN, originates 37 IPv4 prefixes covering 10k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 10,564th-largest of the 79,540 networks we see originating IPv4, and the 3,202nd-largest of 18,430 in the United States. It is seen behind 18 upstream networks, most often AS6453 (TATA Communications (America) Inc) and AS8220 (COLT), and in front of 11 downstream networks. 92% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 92% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

37

IPv6 prefixes

1

IPv4 addresses

10k

IPv6 /64s

65.5k

Upstream graph

The networks AS6421 is seen behind, one and two hops out, drawn from real AS paths.

AS6421Toward the internet core
Upstream graph for AS6421: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS6421TATA COMMUNICATIO…This networkAS4766Korea TelecomAS6453TATA Communicatio…AS6939Hurricane Electri…AS7713PT Telkom Indones…AS8220COLTAS132337AxclusiveAS32590Valve CorporationAS18106Viewqwest Pte LtdAS20130Depaul UniversityAS35280F5 Networks SARLAS3356Lumen (Level 3)AS15576NTS workspace AG

Networks observed one and two hops upstream of AS6421 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

84

adjacent networks

Upstreams
1821%
Peers
5565%
Downstreams
1113%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS6421
NetworkCountryRelationshipPathsVantage pts
AS6453TATA Communications (America) IncUSPeer3,156147
AS8220COLTGBPeer1,88790
AS4766Korea TelecomKRPeer11513
AS6939Hurricane Electric LLCUSPeer836
AS7713PT Telkom Indonesia TbkIDPeer662
AS24482SG.GSSGPeer501
AS132337AxclusiveSGPeer501
AS49544i3D.net B.VNLPeer481
AS23673Cogetel Online, Cambodia, ISPKHPeer431
AS215859Hetzner Cloud - SingaporeDEPeer431

Prefixes

All 38

The largest blocks AS6421 originates, widest first.

Largest prefixes originated by AS6421
PrefixAddressesVisibility
103.16.252.0/2351270/82
103.16.254.0/2351282/82
116.0.66.0/2425682/82
138.104.230.0/2425682/82
138.104.231.0/2425682/82
180.87.13.0/2425682/82
180.87.29.0/2425681/82
180.87.68.0/2425682/82
180.87.91.0/2425681/82
180.87.92.0/2425681/82

Routing health

How AS6421's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid92.1%35
  • Invalid0.0%0
  • No ROA7.9%3

Propagation

  • Globally propagated90% of full-feed peers or more92.1%35
  • Partially propagated40% to 90%2.6%1
  • Seen by few peersUnder 40%5.3%2

Prefix sizes

IPv4 — 37 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 29th Aug 2026.

No announcement by AS6421 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.