Autonomous system
AS6421 AS6421 - TATA COMMUNICATIONS AMERICA INC
Unclassified ARIN
Summary
Tata Communications (America) Inc.
transit legacy
The US arm of Tata Communications, the Indian-headquartered global carrier. The ARIN record sits with Tata Communications (America) Inc. in Herndon, Virginia.
What it's used for
- Carrier and transit services on Tata's global IP backbone: this AS originates a modest set of prefixes rather than serving end users, and the space it carries is drawn from Tata's own address ranges.
- Tata Communications' main global backbone is a separate, much larger AS; this one is a US-registered network within the same group.
Notable
- The ASN was registered with ARIN in 1996, well before Tata's involvement: the US business traces back through Teleglobe and VSNL, which Tata acquired in the 2000s. The registrant name was updated to Tata Communications, so the number carries a lineage older than its current holder.
- Be careful not to conflate this AS with Tata's Indian consumer or enterprise networks; it is the American entity.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 2 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Hong Kong Internet Exchange | Hong Kong, China | 123.255.92.20 |
| Singapore Internet Exchange | Singapore, Singapore | 103.16.102.58 |
Transit providers
11 upstream, 9 downstream and 26 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 26 prefixes · 9.98K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 27 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS6421- Registry name
- AS6421
- Registrant
- TATA COMMUNICATIONS (AMERICA) INC
- Abuse contact
- 6453abuse@tatacommunications.com
- Registered
- 1996-04-09
- Last changed
- 2014-04-22
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 92% valid · 35 valid, 3 with no ROA
- ROAs
- 55 authorising AS6421
- ASPA
- no ASPA record
- IRR
- 95% registered · 36 of 38 announcements
- Route objects
- 234 naming AS6421
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 436 networks and 1,771 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere