AS3257 — GTT-BACKBONE GTT

Network type: transit

AS3257 announces 3,596 IPv4 prefixes covering 4,225,024 addresses and 102 IPv6 prefixes.

About this network

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.

Announced prefixes

• 2.26.180.0/24
• 2.26.184.0/24
• 2.26.220.0/23
• 2.26.240.0/21
• 2.27.172.0/24
• 2.27.218.0/23
• 2.27.220.0/22
• 2.27.232.0/24
• 2.27.235.0/24
• 2.27.238.0/24
• 2.27.247.0/24
• 5.83.96.0/21
• 5.178.16.0/21
• 5.180.4.0/22
• 5.252.77.0/24
• 5.253.202.0/24
• 8.19.112.0/24
• 8.19.203.0/24
• 8.31.122.0/24
• 8.35.16.0/20
• 8.37.186.0/24
• 13.143.152.0/21
• 13.143.177.0/24
• 16.5.72.0/21
• 16.5.118.0/23
• 23.26.5.0/24
• 23.26.6.0/23
• 23.26.8.0/23
• 23.26.11.0/24
• 23.26.12.0/23
• 23.26.16.0/22
• 23.26.21.0/24
• 23.26.22.0/24
• 23.26.198.0/24
• 23.27.3.0/24
• 23.27.8.0/24
• 23.27.30.0/24
• 23.27.114.0/24
• 23.27.134.0/24
• 23.27.216.0/24
• 23.27.238.0/24
• 23.184.144.0/24
• 23.230.1.0/24
• 23.230.64.0/24
• 23.230.121.0/24
• 23.230.186.0/24
• 23.230.234.0/23
• 23.231.111.0/24
• 23.231.115.0/24
• 23.231.120.0/24
• 23.234.128.0/20
• 23.234.156.0/22
• 31.58.54.0/24
• 31.58.131.0/24
• 31.58.139.0/24
• 31.58.169.0/24
• 31.58.221.0/24
• 31.58.222.0/24
• 31.77.20.0/22
• 31.77.24.0/22
• 31.77.215.0/24
• 31.77.224.0/23
• 31.77.242.0/23
• 31.77.250.0/24
• 37.1.152.0/21
• 37.252.30.0/24
• 38.72.160.0/19
• 38.188.202.0/24
• 38.244.113.0/24
• 38.244.114.0/23
• 38.244.121.0/24
• 38.244.126.0/24
• 45.38.206.0/24
• 45.38.234.0/24
• 45.39.66.0/24
• 45.39.77.0/24
• 45.39.95.0/24
• 45.39.161.0/24
• 45.39.174.0/24
• 45.41.12.0/22
• 45.41.60.0/22
• 45.41.132.0/22
• 45.41.136.0/22
• 45.41.144.0/22
• 45.41.164.0/22
• 45.41.174.0/23
• 45.41.180.0/23
• 45.56.128.0/22
• 45.56.136.0/23
• 45.56.140.0/22
• 45.56.146.0/24
• 45.56.148.0/22
• 45.56.152.0/21
• 45.56.160.0/23
• 45.56.168.0/22
• 45.56.176.0/22
• 45.56.180.0/24
• 45.56.182.0/23
• 45.61.64.0/22
• 45.61.102.0/23

and 3,598 more.

Upstream networks

• AS1299 Arelion Sweden AB
• AS174 Cogent Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS2914 NTT America, Inc.
• AS9002 RETN Limited
• AS22652 Videotron Ltee
• AS577 Bell Canada
• AS7018 AT&T Enterprises, LLC
• AS3491 PCCW Global (HK) Ltd.
• AS50300 CustodianDC Limited
• AS55720 Gigabit Hosting Sdn Bhd
• AS23352 DEFT.COM
• AS12389 PJSC Rostelecom
• AS37721 Virtual Technologies & Solutions
• AS12586 GHOSTnet GmbH
• AS6762 TELECOM ITALIA SPARKLE S.p.A.
• AS1103 SURF B.V.
• AS3303 Swisscom (Schweiz) AG
• AS2497 Internet Initiative Japan Inc.
• AS6453 TATA COMMUNICATIONS (AMERICA) INC
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH
• AS29169 GANDI SAS
• AS37100 SEACOM Limited
• AS4637 Telstra Global

Downstream networks

• AS7155 ViaSat,Inc.
• AS22773 Cox Communications Inc.
• AS16509 Amazon.com, Inc.
• AS30036 Mediacom Communications Corp
• AS34984 Superonline Iletisim Hizmetleri A.S.
• AS7029 Windstream Communications LLC
• AS11404 Wave Broadband
• AS12586 GHOSTnet GmbH
• AS8452 IDDQD-AS
• AS9009 M247 Europe SRL
• AS55286 B2 Net Solutions Inc.
• AS62240 Clouvider Limited
• AS18779 EGIHosting
• AS31898 Oracle Corporation
• AS20473 The Constant Company, LLC
• AS7459 Grande Communications Networks, LLC
• AS40676 Psychz Networks
• AS6327 Shaw Communications
• AS30058 FDCservers.net
• AS13335 Cloudflare, Inc.
• AS20115 Charter Communications LLC
• AS6079 RCN
• AS13649 Flexential Colorado Corp.
• AS20940 Akamai International B.V.
• AS12389 PJSC Rostelecom

Adjacent networks

• AS12586 GHOSTnet GmbH
• AS3356 Level 3 Parent, LLC
• AS1299 Arelion Sweden AB
• AS174 Cogent Communications, LLC
• AS9002 RETN Limited
• AS50300 CustodianDC Limited
• AS6453 TATA COMMUNICATIONS (AMERICA) INC
• AS6762 TELECOM ITALIA SPARKLE S.p.A.
• AS34549 meerfarbig GmbH & Co. KG
• AS4134 No.31,Jin-rong Street
• AS55720 Gigabit Hosting Sdn Bhd
• AS2497 Internet Initiative Japan Inc.
• AS37100 SEACOM Limited
• AS3491 PCCW Global (HK) Ltd.
• AS2914 NTT America, Inc.
• AS22652 Videotron Ltee
• AS8452 IDDQD-AS
• AS58453 China Mobile International Limited
• AS7155 ViaSat,Inc.
• AS22773 Cox Communications Inc.
• AS23352 DEFT.COM
• AS7018 AT&T Enterprises, LLC
• AS12389 PJSC Rostelecom
• AS3303 Swisscom (Schweiz) AG
• AS6461 Zayo Bandwidth

Routing security

• RPKI: 934 valid, 130 invalid and 821 not-found announcements; 1,181 ROAs.
• ASPA: 1 authorised providers.
• IRR: 64% of announcements registered; 2,249 route objects.
• Listed in as-sets: AS-10099, AS-197447_ITTMEDIA-AS-SET, AS-32624, AS-36916, AS-36916, AS-494E4341, AS-4D-DC-TRANSIT, AS-53107, AS-53828-TRANSIT, AS-ACT-GLOBAL, AS-BANDXUK, AS-BITCANAL, AS-BSVE:AS-LINX-PEERS-2, AS-BTTELESPANIX, AS-BUNNYCOMM, AS-CFC, AS-CTBC-CUSTOMERS64, AS-CTBC-TOOLS-8, AS-DIGICOMMPS, AS-DMDATA-V6PEERS, AS-GLOBALWAYS-UPSTREAM, AS-GTT, AS-GTTASIA, AS-H1P-EU, AS-HKTPEER.

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• LINX LON1 — London, United Kingdom
• Neutral Internet Exchange — Amsterdam, Netherlands
• Equinix Internet Exchange Ashburn — Ashburn, United States
• New York International Internet Exchange — New York, United States
• Equinix Internet Exchange Miami — Miami, United States