Autonomous system
AS3257 GTT-BACKBONE GTT
Transit DROP-listed space RIPE
Summary
GTT Communications
tier-1 transit backbone
GTT operates a large global IP backbone (GTT-BACKBONE), long ranked as a Tier 1 network, providing transit and enterprise WAN services.
What it's used for
- Global IP transit sold to ISPs, hosting providers, and enterprises.
- Managed networking (SD-WAN, internet, MPLS) for multinational businesses.
Notable
- A Tier 1: reaches the entire internet through settlement-free peering. The AS3257 backbone descends from carriers GTT rolled up, including Tinet and Tiscali International.
- In 2021 GTT sold its physical infrastructure (fibre, subsea cables, and data centers — including the former Hibernia and Interoute assets) to I Squared Capital, which relaunched it as EXA Infrastructure. GTT kept the AS3257 IP transit and its managed-networking business, now riding partly on EXA's fibre.
Interesting
- Because it peers so widely, AS3257 appears frequently as a mid-path transit hop in traceroutes even when neither endpoint is its customer.
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 6 exchanges in 4 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.196.110 |
| LINX LON1 | London, United Kingdom | 195.66.224.32 |
| Neutral Internet Exchange | Amsterdam, Netherlands | 193.239.116.130 |
| Equinix Internet Exchange Ashburn | Ashburn, United States | 206.126.236.19 |
| New York International Internet Exchange | New York, United States | 198.32.160.29 |
| Equinix Internet Exchange Miami | Miami, United States | 198.32.242.151 |
Transit providers
48 upstream, 1,801 downstream and 1,806 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 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 3,919 prefixes · 4.09M addresses IPv6 206 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 4,125 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS3257- Registry name
- GTT-BACKBONE
- Registrant
- AS3257-ROUTE-MNT
- Abuse contact
- abuse@gtt.net
- Registered
- 2002-09-20
- Last changed
- 2026-10-08
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 48% valid · 927 valid, 889 with no ROA 130 RPKI-invalid
- ROAs
- 1,180 authorising AS3257
- ASPA
- 1 declared providers
- IRR
- 86% registered · 1,669 of 1,946 announcements 113 other origin
- Route objects
- 2,241 naming AS3257
Reputation
Classification and threat
Transit Tier-1 or major backbone carrying other networks’ traffic.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
11 DROP matches Announced space overlapping the DROP prefix list.
| Announced | DROP entry | Record |
|---|---|---|
| 76.74.0.0/20 | 76.74.0.0/24 | SBL682547 |
| 76.74.32.0/21 | 76.74.36.0/24 | SBL682548 |
| 76.74.40.0/22 | 76.74.40.0/24 | SBL682546 |
| 76.74.40.0/22 | 76.74.42.0/24 | SBL620979 |
| 76.74.48.0/20 | 76.74.52.0/24 | SBL682549 |
| 76.74.48.0/20 | 76.74.60.0/24 | SBL682550 |
| 76.74.72.0/21 | 76.74.78.0/24 | SBL682551 |
| 86.106.80.0/24 | 86.106.80.0/24 | SBL676378 |
| 107.182.240.0/20 | 107.182.240.0/20 | SBL390277 |
| 188.240.14.0/24 | 188.240.14.0/24 | SBL688281 |
| 209.120.204.0/22 | 209.120.205.0/24 | SBL630035 |
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,775 prefixes, as published 2026-10-11. 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