AS2856 — BT-UK-AS BTnet UK Regional network

Network type: residential

AS2856 announces 525 IPv4 prefixes covering 13,845,248 addresses and 5 IPv6 prefixes.

About this network

BT's UK network (BT-UK-AS, BTnet) — the incumbent British telecom's internet backbone and access network.

What it's used for

• Consumer and business broadband across the UK, plus BTnet leased-line/business internet and a national backbone.

Notable

• A major "eyeball" network; BT's Openreach access infrastructure underpins much of UK broadband, including lines resold by other ISPs.

Interesting

• As the UK's former state monopoly, BT's network is the historic spine of British telecommunications, now carrying everything from home fibre to enterprise WANs.

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

Announced prefixes

• 5.35.192.0/21
• 5.80.0.0/15
• 5.181.136.0/24
• 9.151.0.0/19
• 9.151.208.0/20
• 9.151.248.0/21
• 9.232.192.0/18
• 9.233.48.0/20
• 9.237.96.0/19
• 9.237.128.0/18
• 9.237.192.0/19
• 15.145.20.0/22
• 23.26.70.0/24
• 23.26.108.0/24
• 23.26.117.0/24
• 23.26.131.0/24
• 23.26.192.0/24
• 23.27.32.0/21
• 23.27.40.0/24
• 23.27.102.0/23
• 23.27.104.0/22
• 23.27.108.0/24
• 23.230.82.0/23
• 23.230.242.0/24
• 23.230.252.0/24
• 31.48.0.0/13
• 31.90.0.0/15
• 31.92.0.0/15
• 31.94.0.0/16
• 31.96.0.0/16
• 31.100.0.0/14
• 31.104.0.0/16
• 31.106.0.0/15
• 31.112.0.0/13
• 31.120.0.0/14
• 31.124.0.0/16
• 31.126.0.0/15
• 31.130.240.0/23
• 37.44.229.0/24
• 37.44.230.0/23
• 37.97.112.0/22
• 37.143.3.0/24
• 37.230.61.0/24
• 40.27.28.0/24
• 40.27.72.0/24
• 45.39.116.0/24
• 45.39.188.0/24
• 45.149.7.0/24
• 45.149.168.0/22
• 46.68.0.0/15
• 46.248.96.0/22
• 46.248.102.0/23
• 46.248.104.0/23
• 46.248.120.0/22
• 50.117.7.0/24
• 50.117.51.0/24
• 50.118.154.0/23
• 51.14.0.0/16
• 51.64.32.0/24
• 51.146.44.0/22
• 51.146.128.0/22
• 51.146.136.0/22
• 51.146.235.0/24
• 51.146.252.0/22
• 51.149.18.0/23
• 51.194.36.0/23
• 51.194.100.0/22
• 51.230.0.0/17
• 51.230.255.0/24
• 51.241.3.0/24
• 51.241.201.0/24
• 62.6.0.0/15
• 62.172.8.0/21
• 62.172.16.0/20
• 62.172.32.0/19
• 62.172.64.0/18
• 62.172.128.0/19
• 62.172.160.0/21
• 62.172.168.0/22
• 62.172.172.0/24
• 62.172.174.0/23
• 62.172.176.0/20
• 62.172.192.0/18
• 62.192.124.0/23
• 62.239.0.0/16
• 62.244.11.0/24
• 62.244.12.0/24
• 62.244.29.0/24
• 62.244.36.0/23
• 62.244.41.0/24
• 62.244.43.0/24
• 62.244.45.0/24
• 62.244.56.0/24
• 64.205.136.0/22
• 64.205.144.0/22
• 72.9.180.0/22
• 77.90.135.0/24
• 77.90.138.0/24
• 77.90.145.0/24
• 77.90.151.0/24

and 430 more.

Upstream networks

• AS5400 British Telecommunications Limited
• AS9002 RETN Limited
• AS6461 Zayo Bandwidth
• AS50304 Blix Solutions AS
• AS3303 Swisscom (Schweiz) AG
• AS17639 Converge ICT Solutions Inc.
• AS48185 team.blue NV
• AS50300 CustodianDC Limited
• AS6206 Netrouting B.V.
• AS25180 Exponential-E Ltd.
• AS13030 Init7 (Switzerland) Ltd.

Downstream networks

• AS6871 British Telecommunications Limited
• AS2134 Santander Global Technology and Operations, S.L.
• AS49318 TELEFONICA TECH UK MANAGED SERVICES LTD
• AS54113 Fastly, Inc.
• AS201536 SANDYX SYSTEMS LIMITED
• AS25049 Shell Information Technology International B.V.
• AS21369 Atos IT Services UK Ltd
• AS202206 FAT MEDIA LTD
• AS199675 Willis Group Services Ltd
• AS3573 Accenture LLP
• AS35707 Scottish Power UK PLC
• AS57002 William Hill Organization Ltd
• AS39550 KPMG LLP
• AS36224 HCL AMERICA INC
• AS198386 THRIVE OPERATIONS LIMITED
• AS14931 The St. Paul Travelers Companies, Inc.
• AS28863 Thales UK Limited
• AS15248 Metaswitch Networks Corp.
• AS206237 Barclays Bank PLC
• AS212329 Netcraft Ltd
• AS197545 Era4 Limited
• AS20705 HSBC Bank plc
• AS212565 Specsavers Optical Group Limited
• AS205114 The WEST Retail group LImited
• AS16525 KBR

Adjacent networks

• AS5400 British Telecommunications Limited
• AS9002 RETN Limited
• AS6871 British Telecommunications Limited
• AS50304 Blix Solutions AS
• AS3303 Swisscom (Schweiz) AG
• AS6461 Zayo Bandwidth
• AS2134 Santander Global Technology and Operations, S.L.
• AS48185 team.blue NV
• AS50300 CustodianDC Limited
• AS17639 Converge ICT Solutions Inc.
• AS49318 TELEFONICA TECH UK MANAGED SERVICES LTD
• AS6206 Netrouting B.V.
• AS54113 Fastly, Inc.
• AS201536 SANDYX SYSTEMS LIMITED
• AS25049 Shell Information Technology International B.V.
• AS21369 Atos IT Services UK Ltd
• AS202206 FAT MEDIA LTD
• AS199675 Willis Group Services Ltd
• AS3573 Accenture LLP
• AS28690 Barclays Bank PLC
• AS35707 Scottish Power UK PLC
• AS57002 William Hill Organization Ltd
• AS39550 KPMG LLP
• AS36224 HCL AMERICA INC
• AS198386 THRIVE OPERATIONS LIMITED

Internet exchanges

• LINX LON1 — London, United Kingdom