Autonomous System details

AS5400

British Telecommunications PLC · bt.com

United Kingdom

Mobile

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AS5400 – British Telecommunications PLC

Field	Value
Country	United Kingdom
Website	bt.com
Hosted domains	845
IPv4 addresses	697,600
IPv6 addresses	72,020,566,120,535,032,288,012,524,322,816
ASN type	ISP
Registry	ripe
Allocated	23 years ago on Aug 29, 2002
Updated	3 months ago on Oct 16, 2025

Netblock	Company	Num of IPs
62.134.0.0/16	British Telecommunications PLC	65,536
62.180.0.0/16	British Telecommunications PLC	65,536
195.100.0.0/16	British Telecommunications PLC	65,536
195.163.0.0/16	British Telecommunications PLC	65,536
206.73.0.0/16	INFONET Services Corporation	65,536
213.15.0.0/16	British Telecommunications PLC	65,536
62.5.0.0/17	British Telecommunications PLC	32,768
62.102.0.0/17	British Telecommunications PLC	32,768
166.49.128.0/17	communications networking services Private Unlimited Company	32,768
62.173.192.0/18	British Telecommunications PLC	16,384
212.162.192.0/18	British Telecommunications PLC	16,384
213.194.0.0/18	British Telecommunications PLC	16,384
213.236.64.0/18	British Telecommunications PLC	16,384
31.95.96.0/19	BT Global Fabric Customers	8,192
82.138.160.0/19	Amcor Flexibles Finland OY	8,192
82.150.0.0/19	British Telecommunications PLC	8,192
194.213.64.0/19	British Telecommunications PLC	8,192
195.90.64.0/19	British Telecommunications PLC	8,192
195.182.96.0/19	British Telecommunications PLC	8,192
212.8.160.0/19	British Telecommunications PLC	8,192
212.21.192.0/19	British Telecommunications PLC	8,192
212.31.192.0/19	British Telecommunications PLC	8,192
212.41.128.0/19	British Telecommunications PLC	8,192
212.108.0.0/19	British Telecommunications PLC	8,192
212.127.0.0/19	British Telecommunications PLC	8,192
213.137.160.0/19	British Telecommunications PLC	8,192
31.95.16.0/20	BT Global Fabric Customers	4,096
80.255.160.0/20	BT Global Services Luxembourg S.a.r.l	4,096
195.99.64.0/20	British Telecommunications PLC	4,096
206.73.80.0/20	INFONET BRANCH OFFICE	4,096
31.95.0.0/21	BT Global Fabric Customers	2,048
31.95.48.0/21	BT Global Fabric Customers	2,048
62.172.0.0/21	British Telecommunications PLC	2,048
132.244.64.0/21	Rolls-Royce plc	2,048
132.244.72.0/21	Rolls-Royce plc	2,048
194.74.80.0/21	British Telecommunications PLC	2,048
185.94.0.0/22	British Telecommunications PLC	1,024
195.171.36.0/22	British Telecommunications PLC	1,024
31.95.218.0/23	BT Global Fabric Customers	512
46.248.8.0/23	TNT Express ICS Limited	512
46.248.10.0/23	TNT Express ICS Limited	512
193.58.130.0/23	TESSENDERLO CHEMIE INTERNATIONAL NV	512
203.158.76.0/23	BT Global Fabric customers	512
80.255.160.0/24	BT Global Services Luxembourg	256
80.255.161.0/24	BT Global Services Luxembourg	256
80.255.162.0/24	BT Global Services Luxembourg	256
132.244.240.0/24	Rolls-Royce plc	256
136.238.84.0/24	Schindler Informatik AG	256
136.238.85.0/24	Schindler Informatik AG	256
136.238.224.0/24	Schindler Informatik AG	256
185.249.4.0/24	Lumileds Holding B.V.	256
192.109.52.0/24	Thales Deutschland GmbH	256
193.202.26.0/24	Kantar GmbH	256
194.33.53.0/24	KANTAR DORMANT 3 LIMITED	256
194.33.54.0/24	KANTAR DORMANT 3 LIMITED	256
194.33.55.0/24	KANTAR DORMANT 3 LIMITED	256
194.50.160.0/24	Hyundai Motor Europe GmbH	256
194.76.40.0/24	Infonet Network Services Germany	256
194.107.114.0/24	CEVA France SASU	256
195.36.82.0/24	Computacenter AG & Co. oHG, Computacenter Park 1, 50170 Kerpen	256
195.60.182.0/24	DeLaval International AB	256
195.60.183.0/24	DeLaval International AB	256
195.66.70.0/24	Kia Europe GmbH	256
198.178.236.0/24	KANTAR	256
204.52.188.0/24	KANTAR	256

Netblock	Company
2a00:2000::/23	British Telecommunications PLC
2a00:2200::/25	British Telecommunications PLC
2a00:2280::/25	British Telecommunications PLC
2a00:2300::/25	British Telecommunications PLC
2a0c:7c80::/29	Thales Deutschland GmbH
2a0c:8480::/30	Hitachi Rail GTS Deutschland GmbH
2001:740::/32	British Telecommunications PLC
2a00:2200:200::/40	British Telecommunications PLC
2a00:2200:300::/40	British Telecommunications PLC
2a00:2200:900::/40	British Telecommunications PLC
2a00:2200:b00::/40	British Telecommunications PLC
2a00:2200:d00::/40	British Telecommunications PLC
2a00:2200:2000::/40	British Telecommunications PLC
2a00:2200:5300::/40	British Telecommunications PLC

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IP Ranges API

WHOIS Details

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                                                ASHandle:       AS5400
                                                OrgID:          AS5400
                                                ASName:         AS5400
                                                ASNumber:       AS5400
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA

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IP WHOIS API & Database

Hosted Domains

There are 845 domain names hosted across 196 IP addresses on this ASN.

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IP Address	Domain	Domains on this IP
212.108.4.142	██████████	87
80.255.163.72	██████████	85
62.134.42.244	████████	77
62.180.131.137	██████████	71
62.180.131.138	██████████	65
212.108.4.216	██████████	26
62.134.89.36	██████████	23
213.236.117.34	██████████	19
62.180.126.137	██████████	18
212.41.142.54	██████████	13

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Hosted Domains API & Database

Peers

There are 162 peers for this ASN.

Peers	Name
AS10780	Pure Storage, INC.
AS11164	Internet2
AS1120	ACONET
AS12257	Dell, Inc.
AS12298	QIAGEN GmbH
AS12331	Audi AG
AS12389	PJSC Rostelecom
AS12430	VODAFONE ESPANA S.A.U.
AS12440	Hughes Network Systems GmbH
AS12552	GlobalConnect AB
AS1257	Tele2 Sverige AB
AS1267	WIND TRE S.P.A.
AS1273	Vodafone Group PLC
AS12734	Stellantis Auto SAS
AS12956	TELXIUS Cable
AS1299	Arelion Sweden AB
AS13030	Init7 (Switzerland) Ltd.
AS13130	Autostadt GmbH
AS13205	British Telecommunications PLC
AS132203	Tencent Building, Kejizhongyi Avenue
AS13335	Cloudflare, Inc.
AS14361	HopOne Internet Corporation
AS14907	Wikimedia Foundation Inc.
AS15410	BT Limited Magyarorszagi Fioktelepe
AS15412	FLAG TELECOM UK LIMITED
AS15466	Commando Materieel en IT
AS15518	Circular Informationssysteme GmbH
AS15695	Expereo International BV
AS16147	Politie Nederland
AS16839	SERVICENOW, INC.
AS174	Cogent Communications, LLC
AS1741	CSC - Tieteen tietotekniikan keskus Oy
AS1828	Unitas Global
AS1836	green.ch AG
AS1853	ACONET
AS19151	BroadbandONE, LLC
AS1955	KIFU (Governmental Info Tech Development Agency)
AS199524	G-Core Labs S.A.
AS199541	EUROCONTROL, the European Organisation for the Safety of Air Navigation
AS200361	CONCENTRIX SERVICES BULGARIA EOOD
AS200500	Vesta Payment Solutions Limited
AS202097	IBERMUTUA
AS202666	International Flavors & Fragrances I.F.F. (Nederland) B.V
AS203990	Accertify LLC
AS20473	The Constant Company, LLC
AS20485	Joint Stock Company TransTeleCom
AS20561	Schaeffler Technologies AG & Co. KG
AS206625	Enterprise Holdings, Inc.
AS20676	Plusnet GmbH
AS207180	HCL Technologies Germany GmbH
AS208053	Clarins SAS
AS20868	ABB Information Systems Ltd
AS20940	Akamai International B.V.
AS21000	Atos France SAS
AS2110	Enet Communications LIMITED
AS212565	Specsavers Optical Group Limited
AS21277	Allay Nawroz Telecom Company for Communication/Ltd.
AS21320	GEANT Vereniging
AS21489	The North Atlantic Treaty Organization
AS22683	PHILIPS INTERNET
AS23764	CTGNet
AS24961	WIIT AG
AS2497	Internet Initiative Japan Inc.
AS25049	Shell Information Technology International B.V.
AS2516	KDDI CORPORATION
AS25261	IBERIA LINEAS AEREAS DE ESPANA SOCIEDAD ANONIMA OPERADORA
AS26380	MasterCard Technologies LLC
AS2686	AT&T Enterprises, LLC
AS27311	Biogen MA Inc
AS2856	British Telecommunications PLC
AS286	GTT Communications Inc.
AS28879	Media-Saturn-Holding GmbH
AS2906	Netflix Streaming Services Inc.
AS29063	Eviden Netherlands B.V.
AS29119	AIRE NETWORKS DEL MEDITERRANEO SL UNIPERSONAL
AS30614	Dell, Inc.
AS30781	Free Pro SAS
AS30864	Elavon Financial Services DAC
AS31027	GlobalConnect A/S
AS31614	European Central Bank
AS3257	GTT Communications Inc.
AS32590	Valve Corporation
AS3303	Swisscom (Switzerland) Ltd
AS3320	Deutsche Telekom AG
AS3333	Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
AS3356	Level 3 Parent, LLC
AS33873	Arvato Systems GmbH
AS33891	Core-Backbone GmbH
AS34311	LG CNS Europe B.V
AS34460	PHOENIX International Holdings GmbH
AS3491	PCCW Global, Inc.
AS35280	F5 Networks SARL
AS3573	Accenture LLP
AS37100	SEACOM Limited
AS37468	Angola Cables
AS38191	Infosys Technologies Ltd
AS39351	31173 Services AB
AS394805	ReliaQuest, LLC
AS39737	Prime Telecom srl
AS40126	Molson Coors Beverage Company

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ASN API & Database

Upstreams

There are 14 upstreams for this ASN.

upstreams	Name
AS12956	TELXIUS Cable
AS1299	Arelion Sweden AB
AS174	Cogent Communications, LLC
AS3257	GTT Communications Inc.
AS3320	Deutsche Telekom AG
AS3356	Level 3 Parent, LLC
AS3491	PCCW Global, Inc.
AS4637	Telstra Global
AS5511	Orange S.A.
AS6453	TATA COMMUNICATIONS (AMERICA) INC
AS6461	Zayo Bandwidth
AS6762	TELECOM ITALIA SPARKLE S.p.A.
AS6830	Liberty Global Europe Holding B.V.
AS6939	Hurricane Electric LLC

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ASN API & Database

Downstreams

There are 65 downstreams for this ASN.

Downstreams	Name
AS10780	Pure Storage, INC.
AS12257	Dell, Inc.
AS12298	QIAGEN GmbH
AS12331	Audi AG
AS12440	Hughes Network Systems GmbH
AS12734	Stellantis Auto SAS
AS13130	Autostadt GmbH
AS13205	British Telecommunications PLC
AS15410	BT Limited Magyarorszagi Fioktelepe
AS15466	Commando Materieel en IT
AS15518	Circular Informationssysteme GmbH
AS16839	SERVICENOW, INC.
AS174	Cogent Communications, LLC
AS199541	EUROCONTROL, the European Organisation for the Safety of Air Navigation
AS200361	CONCENTRIX SERVICES BULGARIA EOOD
AS200500	Vesta Payment Solutions Limited
AS202097	IBERMUTUA
AS202666	International Flavors & Fragrances I.F.F. (Nederland) B.V
AS203990	Accertify LLC
AS20561	Schaeffler Technologies AG & Co. KG
AS206625	Enterprise Holdings, Inc.
AS207180	HCL Technologies Germany GmbH
AS208053	Clarins SAS
AS20868	ABB Information Systems Ltd
AS21000	Atos France SAS
AS2110	Enet Communications LIMITED
AS212565	Specsavers Optical Group Limited
AS21489	The North Atlantic Treaty Organization
AS22683	PHILIPS INTERNET
AS25049	Shell Information Technology International B.V.
AS25261	IBERIA LINEAS AEREAS DE ESPANA SOCIEDAD ANONIMA OPERADORA
AS26380	MasterCard Technologies LLC
AS27311	Biogen MA Inc
AS2856	British Telecommunications PLC
AS28879	Media-Saturn-Holding GmbH
AS29063	Eviden Netherlands B.V.
AS30614	Dell, Inc.
AS30864	Elavon Financial Services DAC
AS31614	European Central Bank
AS3356	Level 3 Parent, LLC
AS33873	Arvato Systems GmbH
AS34311	LG CNS Europe B.V
AS34460	PHOENIX International Holdings GmbH
AS3573	Accenture LLP
AS38191	Infosys Technologies Ltd
AS394805	ReliaQuest, LLC
AS40126	Molson Coors Beverage Company
AS40999	dus.net GmbH
AS41321	Fsas Technologies GmbH
AS42848	European Commission
AS43033	Telio Communications GmbH
AS43949	Marsh Limited
AS48647	Solvay SA
AS5091	Stripe, Inc.
AS51046	Bringo Limited
AS51466	Bridgestone Europe NV
AS51527	AUTOEVER EUROPE
AS59724	Elsevier Limited
AS60112	Clarins SAS
AS72	Schlumberger Limited
AS7246	Bristol-Myers Squibb Company
AS7734	Toronto Dominion Bank
AS8590	Bayerische Motoren Werke Aktiengesellschaft
AS8903	LYNTIA NETWORKS S.A.
AS8968	BT Italia S.p.A.

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ASN API & Database

Pingable IPs

445 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
193.58.130.10	AS5400 British Telecommunications PLC	`7.44ms` from Amsterdam, NL
195.99.66.220	AS5400 British Telecommunications PLC	`0.62ms` from Amsterdam, NL
166.49.179.99	AS5400 British Telecommunications PLC	`0.41ms` from Ashburn, US
195.100.177.57	AS5400 British Telecommunications PLC	`1.00ms` from Aubervilliers, FR
62.180.51.57	AS5400 British Telecommunications PLC	`3.51ms` from Frankfurt am Main, DE
62.134.168.138	AS5400 British Telecommunications PLC	`17.19ms` from Frankfurt am Main, DE
62.134.68.44	AS5400 British Telecommunications PLC	`4.08ms` from Frankfurt am Main, DE
166.49.228.233	AS5400 British Telecommunications PLC	`0.69ms` from Frankfurt am Main, DE
212.162.233.73	AS5400 British Telecommunications PLC	`17.92ms` from London, GB
212.127.11.24	AS5400 British Telecommunications PLC	`0.72ms` from London, GB
166.49.195.225	AS5400 British Telecommunications PLC	`0.51ms` from London, GB
212.31.206.226	AS5400 British Telecommunications PLC	`9.95ms` from Madrid, ES
166.49.211.114	AS5400 British Telecommunications PLC	`0.88ms` from Milan, IT
212.21.192.144	AS5400 British Telecommunications PLC	`23.63ms` from Milan, IT
194.213.68.242	AS5400 British Telecommunications PLC	`0.79ms` from Paris, FR
166.49.160.41	AS5400 British Telecommunications PLC	`6.74ms` from Vienna, AT
2a00:2000:2074::	AS5400 British Telecommunications PLC	`0.99ms` from Vienna, AT
166.49.239.246	AS5400 British Telecommunications PLC	`0.65ms` from Amsterdam, NL
212.108.0.121	AS5400 British Telecommunications PLC	`0.88ms` from Amsterdam, NL
212.108.6.141	AS5400 British Telecommunications PLC	`1.05ms` from Amsterdam, NL
166.49.198.13	AS5400 British Telecommunications PLC	`1.30ms` from Dublin, IE
62.134.204.66	AS5400 British Telecommunications PLC	`1.52ms` from Frankfurt am Main, DE
2a00:2000:80::82	AS5400 British Telecommunications PLC	`7.14ms` from Frankfurt am Main, DE
166.49.193.128	AS5400 British Telecommunications PLC	`0.68ms` from Frankfurt am Main, DE
166.49.172.11	AS5400 British Telecommunications PLC	`0.47ms` from Frankfurt am Main, DE

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
213.193.234.40	AS15703 TrueServer BV AS number	`0.43ms` from Amsterdam, NL
44.210.216.40	AS14618 Amazon.com, Inc.	`0.58ms` from Ashburn, US
77.33.66.184	AS44869 FIBIA P/S	`1.59ms` from Copenhagen, DK
100.42.83.40	AS62643 Evertek, Inc	`6.55ms` from Des Moines, US
47.99.110.24	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`4.63ms` from Hangzhou, CN
58.176.166.40	AS9269 Hong Kong Broadband Network Ltd.	`1.15ms` from Hong Kong, HK
45.143.113.104	AS43915 TrueSpeed Communications Limited	`4.09ms` from London, GB
24.50.99.72	AS11290 Cogeco Connexion inc	`8.79ms` from Montreal, CA
58.94.142.136	AS4713 NTT DOCOMO BUSINESS,Inc.	`3.60ms` from Osaka, JP
166.140.87.232	AS6167 Verizon Business	`19.82ms` from Santa Clara, US
32.208.11.184	AS46690 Southern New England Telephone Company and SNET America, Inc.	`8.31ms` from Secaucus, US
125.146.176.88	AS4766 Korea Telecom	`2.58ms` from Seoul, KR
13.237.37.88	AS16509 Amazon.com, Inc.	`0.13ms` from Sydney, AU
60.32.137.216	AS4713 NTT DOCOMO BUSINESS,Inc.	`2.69ms` from Tokyo, JP
141.95.125.24	AS16276 OVH SAS	`0.11ms` from Frankfurt am Main, DE
84.16.237.8	AS28753 Leaseweb Deutschland GmbH	`0.53ms` from Frankfurt am Main, DE
87.191.157.40	AS3320 Deutsche Telekom AG	`7.54ms` from Frankfurt am Main, DE
102.219.144.120	AS327960 PC Maniacs (Pty) Ltd	`1.48ms` from Johannesburg, ZA
86.141.172.216	AS2856 British Telecommunications PLC	`2.27ms` from London, GB
70.38.77.200	AS32613 Leaseweb Canada Inc.	`0.84ms` from Montreal, CA
68.47.212.248	AS7922 Comcast Cable Communications, LLC	`11.83ms` from Murfreesboro, US
109.220.238.8	AS3215 Orange S.A.	`13.61ms` from Paris, FR
123.132.27.168	AS4837 CHINA UNICOM China169 Backbone	`6.89ms` from Qingdao, CN
47.64.202.232	AS3209 Vodafone GmbH	`17.08ms` from Berlin, DE
175.146.173.56	AS4837 CHINA UNICOM China169 Backbone	`6.45ms` from Liaoyang, CN

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this ASN. Learn more.

traceroute -a -n -q1 212.8.166.73

traceroute to 212.8.166.73 (212.8.166.73): 64 hops max, 52 byte packets

1 [AS14061] 5.101.110.7 0.552 ms

2 [] 143.244.192.24 0.196 ms

3 [] 143.244.224.82 0.459 ms

4 [] 143.244.224.81 0.341 ms

5 [] 80.249.208.108 0.841 ms

6 [AS5400] 166.49.164.131 0.864 ms

7 [AS5400] 166.49.208.96 12.543 ms

8 [AS5400] 166.49.224.183 11.51 ms

9 [AS5400] 212.8.166.73 12.49 ms

Measurement taken from

IPinfo ProbeNet in Amsterdam, NL

On December 28th 2025

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What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS5400 at robtex.

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