AS31655 — ASN-GAMMATELECOM

AS31655 announces 29 IPv4 prefixes covering 609,536 addresses and 3 IPv6 prefixes.

About this network

ASN-GammaTelecom is operated by Gamma Telecom Holdings Ltd.

What it's used for

• The address space carries business and enterprise connectivity, evidenced by netnames such as UK-GTL, GAMMA-2, and GTL registered to Gamma Telecom entities.
• With 609,536 IPv4 addresses announced across 52 prefixes and 36 observed neighbours, the ratio suggests a significant access or regional ISP role rather than pure transit.

Notable

• Registrants consistently align with the announcer, listing Gamma Telecom Limited and Gamma Telecom Holdings Ltd across the sampled prefixes.
• The company was established in 2001 to acquire assets from distressed telecommunications businesses, including Atlantic Telecom, and has since operated as a UK-based telecom provider.
• The inventory includes a mix of /16, /17, and /18 blocks, indicating a large and diverse address estate managed for various service tiers.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 5.2.96.0/19
• 5.144.156.0/22
• 46.227.48.0/21
• 51.52.0.0/16
• 51.219.0.0/16
• 62.223.128.0/17
• 79.74.0.0/16
• 80.252.64.0/20
• 88.215.0.0/18
• 89.213.8.0/21
• 89.213.16.0/20
• 89.213.32.0/21
• 92.207.0.0/16
• 138.248.16.0/20
• 138.248.32.0/20
• 138.248.128.0/17
• 151.2.128.0/17
• 157.125.0.0/16
• 157.231.0.0/16
• 164.39.128.0/17
• 185.4.196.0/22
• 185.9.232.0/22
• 185.21.208.0/22
• 185.47.104.0/22
• 185.157.103.0/24
• 188.66.64.0/18
• 193.39.16.0/20
• 195.162.96.0/19
• 213.218.192.0/20
• 2a02:c1c0::/29
• 2a02:df80::/29
• 2a04:4440::/29

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS2914 NTT America, Inc.
• AS6939 Hurricane Electric LLC
• AS33891 Core-Backbone GmbH
• AS50300 CustodianDC Limited
• AS24482 SG.GS
• AS35280 F5 Networks SARL
• AS4637 Telstra Global
• AS13030 Init7 (Switzerland) Ltd.

Downstream networks

• AS204193 Gamma Telecom Holdings Ltd
• AS8918 Coolwave Communications Limited
• AS198472 Manchester City Council
• AS216167 Gamma Telecom Holdings Ltd
• AS41553 Reed Specialist Recruitment Limited
• AS205237 SAVILLS PLC

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS2914 NTT America, Inc.
• AS6939 Hurricane Electric LLC
• AS204193 Gamma Telecom Holdings Ltd
• AS8918 Coolwave Communications Limited
• AS198472 Manchester City Council
• AS216167 Gamma Telecom Holdings Ltd
• AS41553 Reed Specialist Recruitment Limited
• AS33891 Core-Backbone GmbH
• AS205237 SAVILLS PLC
• AS24482 SG.GS
• AS50300 CustodianDC Limited
• AS35280 F5 Networks SARL
• AS4637 Telstra Global
• AS13030 Init7 (Switzerland) Ltd.

Routing security

• RPKI: 27 valid, 0 invalid and 12 not-found announcements; 24 ROAs.
• ASPA: none published.
• IRR: 82% of announcements registered; 52 route objects.
• Listed in as-sets: AS-4D-DC-LINX, AS-4D-DC-LONAP, AS-GAMMATELECOM, AS-GLOBEINTERNET-CLIENTS, AS-GLOBEINTERNET-CLIENTS, AS-GTTCUST, AS-GTTCUST6, AS-LONAP-CONNECTED, AS-MANDA-LINX-PEERS-V4, AS-MANDA-LINX-PEERS-V6, AS-PKXG-EXPRESS, AS-PLUSNETUK:AS-LONAP-PEERS-PRI, AS-PLUSNETUK:AS-LONAP-PEERS-SEC, AS51202:AS-ALL.

Internet exchanges

• LINX LON1 — London, United Kingdom
• London Network Access Point — London, United Kingdom
• LINX Manchester — Manchester, United Kingdom