AS3300 British Telecommunications Limited

United Kingdom BT RIPE 123 IPv4 prefixes 29 IPv6 prefixes

IPv4 addresses

513,280

IPv6 /48 networks

131,072

RPKI

108 valid44 no ROA

Peers and downstreams

Holder

AS name: BT
Description: British Telecommunications Limited
Organisation: British Telecommunications Limited
Abuse contact: abuse@eu.bt.net
Assigned: 1994-10-27
Registered: 2002-09-19
Record last changed: 2026-05-05 07:24 UTC

136.238.168.0/24 136.238.185.0/24 136.238.187.0/24 136.238.229.0/24 136.238.232.0/24 136.238.238.0/24 136.238.239.0/24 136.238.240.0/24 136.238.241.0/24 136.238.243.0/24 185.249.5.0/24 185.249.6.0/24 192.157.130.0/23 192.157.132.0/22 192.157.136.0/21 192.157.144.0/20 192.157.160.0/23 192.237.64.0/18 192.92.18.0/24 192.92.19.0/24 192.92.20.0/22 192.92.24.0/21 192.92.32.0/19 192.92.80.0/23 192.92.82.0/24 194.33.52.0/24 195.206.69.0/24 195.206.70.0/24 198.137.75.0/24 198.178.237.0/24 198.178.239.0/24 198.207.127.0/24 198.207.64.0/18 198.207.64.0/22 198.207.67.0/24 198.207.68.0/22 198.207.72.0/22 198.207.74.0/24 198.207.75.0/24 198.207.76.0/22 198.207.78.0/24 198.207.79.0/24 198.207.80.0/22 199.6.64.0/18 203.187.128.0/19 203.187.128.0/22 203.187.145.0/24 203.187.146.0/24 204.140.64.0/18 204.231.0.0/17 204.231.128.0/18 204.52.187.0/24 204.79.84.0/24 205.248.0.0/16 206.182.0.0/16 206.182.128.0/18 206.182.134.0/24 206.182.164.0/24 206.182.192.0/18 207.117.0.0/16 207.209.0.0/16 207.209.0.0/19 207.209.64.0/19 209.28.0.0/16 209.28.174.0/24 61.14.0.0/18 61.14.1.0/24 61.14.11.0/24 61.14.12.0/22 61.14.15.0/24 61.14.2.0/23 61.14.20.0/22 61.14.24.0/22 61.14.28.0/22 61.14.31.0/24 61.14.32.0/22 61.14.34.0/24 61.14.36.0/22 61.14.36.0/24 61.14.39.0/24 61.14.4.0/22 61.14.40.0/22 61.14.44.0/22 61.14.48.0/22 61.14.52.0/24 61.14.7.0/24 61.14.8.0/22 63.250.128.0/18 63.250.128.0/22 63.250.131.0/24 63.250.132.0/22 63.250.132.0/24 63.250.135.0/24 63.250.136.0/23 63.250.138.0/24 63.250.139.0/24 63.250.140.0/22 63.250.144.0/22 63.250.144.0/24 63.250.147.0/24 63.250.148.0/22 63.250.151.0/24 63.250.152.0/22 63.250.155.0/24 63.250.156.0/22 63.250.159.0/24 63.250.160.0/22 63.250.163.0/24 63.250.164.0/24 63.250.165.0/24 63.250.168.0/22 63.250.171.0/24 63.250.172.0/24 63.250.173.0/24 63.250.174.0/24 63.250.176.0/22 63.250.180.0/22 63.250.184.0/22 63.250.187.0/24 63.250.189.0/24 63.250.191.0/24 72.29.128.0/20 72.29.132.0/22

Routing changes

Last 30 days

2026-10-04 08:50 UTC	Neighbour gone	AS264409	upstream
2026-10-04 08:50 UTC	Neighbour gone	AS7195	upstream
2026-10-04 08:50 UTC	Relationship changed	AS9304	upstream to peer
2026-10-04 08:50 UTC	New neighbour	AS8359	peer
2026-10-04 08:50 UTC	Relationship changed	AS8220	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS7713	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS6830	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS61626	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS6057	upstream to peer
2026-10-04 08:50 UTC	New neighbour	AS5400	peer
2026-10-04 08:50 UTC	Relationship changed	AS4635	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS4230	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS37468	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS3741	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS33891	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS31713	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS2518	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS2497	upstream to peer
2026-10-04 08:50 UTC	New neighbour	AS20473	peer
2026-10-04 08:50 UTC	Relationship changed	AS14840	upstream to peer
2026-10-04 08:50 UTC	Relationship changed	AS137409	upstream to peer

WHOIS

aut-num:        AS3300
as-name:        BT
org:            ORG-CNS3-RIPE
remarks:        ---------------------------------------------
remarks:        Upstreams:
remarks:        ---------------------------------------------
remarks:        ---------------------------------------------
remarks:        Peers:
remarks:        ---------------------------------------------
remarks:        
remarks:        ALL peering requests see
remarks:        www.bt.net/cgi-bin/peering-request
remarks:        
remarks:        for technical issues, pls contact: peering@bt.com
remarks:        
remarks:        for abuse, pls contact abuse@eu.bt.net
remarks:        
remarks:        24/7 NOC email / network@bt.com
remarks:        24/7 NOC phone / +44 203 7882214 opt 1
remarks:        
remarks:        This object describes non-customer peerings
remarks:        Customer peerings are described in the macro AS-BT-XX
remarks:        
remarks:        ( replace XX with the country code
remarks:        JP, AU, HK, SG, JP, ZA, US, CALA )
remarks:        
remarks:        The following BGP communities are available to customers
remarks:        to AS prepend their prefixes towards the following networks
remarks:        
remarks:        Network One Prepend Two Prepends
remarks:        ------------ ----------- ------------
remarks:        Telstra 3300:4113 3300:4114
remarks:        NTT 3300:4117 3300:4118
remarks:        Telia 3300:4119 3300:4120
remarks:        Starhub 3300:4123 3300:4124
remarks:        TATA 3300:4125 3300:4126
remarks:        Lumen 3300:4127 3300:4128
remarks:        PCCW 3300:4131 3300:4132
remarks:        Zayo 3300:4133 3300:4134
remarks:        LiquidTelecom 3300:4135 3300:4136
remarks:        
status:         ASSIGNED
admin-c:        IRA3-RIPE
tech-c:         INMC1-RIPE
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         CIP-MNT
created:        2002-09-19T07:20:43Z
last-modified:  2026-05-05T07:24:59Z
source:         RIPE
% 303 routing policy lines (import/export) not shown

Routing data

Updated just now

Registry record

Fetched just now from RIPE

Prefixes and neighbours come from the RIPE RIS route collectors. Data older than 5 minutes is refreshed when this page is opened.

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/asn/3300

const res = await fetch('https://ip-fd.net/api/v1/asn/3300', {
  headers: { 'X-API-Key': 'YOUR_KEY' }
});
const data = await res.json();
console.log(data);

import requests

r = requests.get('https://ip-fd.net/api/v1/asn/3300', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/3300');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-API-Key: YOUR_KEY']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = json_decode(curl_exec($ch), true);
print_r($data);

req, _ := http.NewRequest("GET", "https://ip-fd.net/api/v1/asn/3300", nil)
req.Header.Set("X-API-Key", "YOUR_KEY")
res, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Works without a key at a lower rate. Get a free key.

AS1299	Arelion Sweden AB TWELVE99
AS2914	NTT America, Inc. NTT-DATA-2914
AS3303	Swisscom (Schweiz) AG SWISSCOM
AS3491	PCCW Global (HK) Ltd. PCCWG-APAC-HK
AS4637	Telstra Global ASN-TELSTRA-GLOBAL
AS4657	StarHub Ltd STARHUB-INTERNET
AS6461	Zayo Bandwidth ZAYO-6461
AS6762	TELECOM ITALIA SPARKLE S.p.A. SEABONE-NET
AS6939	Hurricane Electric LLC HURRICANE
AS9002	RETN Limited RETN-AS
AS30844	Liquid Telecommunications Ltd LIQUID-AS

AS72
AS78
AS6220	inContact Inc. AS6220
AS7246	Bristol-Myers Squibb Company BMS-AS
AS12200	Rackspace Hosting RACKSPACE
AS18872	Veritas Technologies LLC VERITAS
AS22683	Koninklijke Philips N.V. PHILIPS-INTERNET
AS26380	MasterCard Technologies LLC MASTER-7-AS
AS26478	Novartis Pharmaceuticals NOVARTIS-PHARMA
AS27000	Coty Inc. COTYINC
AS40126	Molson Coors Beverage Company AS-MOLSONCOORS
AS40659	BMW of North America, LLC (Group Data Centers America) BMW-GDCA-AS
AS45187	Rackspace IT Hosting AS IT Hosting Provider Hong Kong RACKSPACE-AP
AS55290	Depository Trust & Clearing Corporation DTCC-CDZ-CVO
AS133782	Elsevier Ltd ELSEVIER-ASIAPACIFIC-AS-AP
AS136767	BMW AG (Bayerische Motoren Werke Aktiengesellschaft) BMW-AG-AS-AP
AS141399	Specsavers Pty Ltd SPECSAVERSPTYLTD-AS-AP
AS212565	Specsavers Optical Group Limited SPECSAVERS
AS393493	Lotte Biologics USA, LLC LOTTEBIOLOGICS
AS399449	Kyndryl KYNDRYL-POP-ASN

AS917	Misaka Network, Inc. MISAKA
AS1403	EBOX
AS1828	Unitas Global UNITAS
AS2497	Internet Initiative Japan Inc. IIJ
AS2518	BIGLOBE Inc. BIGLOBE
AS3741	Dimension Data
AS4230	CLARO S.A. AS4230
AS4635	Hong Kong Internet Exchange--Route Server 1 HKIX-RS1
AS5400	British Telecommunications Limited BT
AS6057	Administracion Nacional de Telecomunicaciones AS6057
AS6830	Liberty Global Europe Holding B.V. LibertyGlobal
AS7713	PT Telekomunikasi Indonesia telkomnet-as-ap
AS8220	COLT Technology Services Group Limited COLT
AS8359	MTS PJSC MTS
AS9304	HGC Global Communications Limited HUTCHISON-AS-AP
AS14840	BR.Digital Telecom AS14840
AS14907	Wikimedia Foundation Inc. WIKIMEDIA
AS18106	Viewqwest Pte Ltd VIEWQWEST-SG-AP
AS19151	BroadbandONE, LLC BBO-1
AS20473	The Constant Company, LLC AS-VULTR
AS22548	Nucleo de Inf. e Coord. do Ponto BR - NIC.BR AS22548
AS22652	Fibrenoire-Internet FIBRENOIRE-INTERNET
AS24482	SG.GS SGGS-AS-AP
AS28624	PROVEDORA CMA INTERNET LTDA AS28624
AS28634	Life Tecnologia Ltda. AS28634
AS31713	Gateway Communications GWCOMMS-MPLS
AS33891	Core-Backbone GmbH CORE-BACKBONE
AS35280	F5 Networks SARL F5
AS36236	NetActuate, Inc NETACTUATE
AS37468	Angola Cables
AS37697	WEBMASTERS, LDA.
AS37721	Virtual Technologies & Solutions
AS45489	Sri Lanka Telecom PLC, GLobal Peering SLT-GLOBAL
AS49544	i3D.net B.V i3Dnet
AS51185	MainStreaming SpA MAINSTREAMING-AS
AS52320	GlobeNet Cabos Submarinos Colombia, S.A.S. AS52320
AS52873	Softdados Telecomunicacoes AS52873
AS55720	Gigabit Hosting Sdn Bhd GIGABIT-MY
AS58057	Securebit AG SECUREBIT
AS60503	FNX Tecnologia LTDA FNXTEC
AS61573	IP TELECOM AS61573
AS61626	UNIVERSIDADE ESTADUAL DE PONTA GROSSA AS61626
AS137409	GSL Networks Pty LTD GSLNETWORKS-AS-AP
AS198150	SIACOM JSC SIACOM-AS
AS199524	G-Core Labs S.A. GCORE
AS262427	Invista Net Provedor de Acesso Ltda AS262427
AS263152	MIGO TELECOM AS263152
AS263237	PowerHost Telecom SPA AS263237
AS264479	Turbozone Internet AS264479
AS271253	LINK BRASIL TELECOMUNICACOES LTDA AS271253
AS328320	Kurlec Wireless (PTY) Ltd