All ASNs

Autonomous System details for AS5400

AS5400

British Telecommunications Limited • bt.com

AS5400 — British Telecommunications Limited

AS Name

Country

United Kingdom (GB)

Website

bt.com

Number of IPv4

734,464

Number of IPv6

7.3 × 10³¹

ASN type

ISP

Status

Allocated

Registry

RIPE

Allocated

August 29, 2002

Last updated

March 18, 2026

IP Ranges

85 IPv4 prefixes, 40 IPv6 prefixes

Prefix	Company	Number of IPs
31.95.0.0/21	British Telecommunications Limited	2,048
31.95.14.0/23	British Telecommunications Limited	512
31.95.16.0/20	British Telecommunications PLC	4,096
31.95.48.0/21	British Telecommunications Limited	2,048
31.95.56.0/24	British Telecommunications PLC	256
31.95.64.0/21	British Telecommunications Limited	2,048
31.95.96.0/19	British Telecommunications Limited	8,192
31.95.160.0/20	British Telecommunications PLC	4,096
31.95.184.0/21	British Telecommunications PLC	2,048
31.95.208.0/21	British Telecommunications PLC	2,048
31.95.218.0/23	British Telecommunications PLC	512
31.95.220.0/22	British Telecommunications PLC	1,024
31.95.240.0/22	British Telecommunications PLC	1,024
31.95.246.0/23	British Telecommunications Limited	512
31.95.248.0/22	British Telecommunications PLC	1,024
31.95.254.0/23	British Telecommunications Limited	512
46.248.8.0/23	FedEx Express International B.V.	512
46.248.10.0/23	FedEx Express International B.V.	512
62.5.0.0/17	British Telecommunications PLC	32,768
62.102.0.0/17	British Telecommunications Limited	32,768
62.134.0.0/16	British Telecommunications Limited	65,536
62.172.0.0/21	British Telecommunications PLC	2,048
62.173.192.0/18	British Telecommunications Limited	16,384
62.180.0.0/16	British Telecommunications Limited	65,536
80.255.160.0/20	BT Global Services Luxembourg S.a.r.l	4,096
80.255.160.0/24	BT Global Services Luxembourg S.a.r.l	256
80.255.161.0/24	BT Global Services Luxembourg	256
80.255.162.0/24	BT Global Services Luxembourg	256
82.138.160.0/19	BaseN Corporation	8,192
82.150.0.0/19	British Telecommunications Limited	8,192
132.244.64.0/21	Rolls-Royce plc	2,048
132.244.72.0/21	Rolls-Royce plc	2,048
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
166.49.128.0/17	British Telecommunications PLC	32,768
185.94.0.0/22	British Telecommunications Limited	1,024
185.249.4.0/24	Lumileds Holding B.V.	256
192.109.52.0/24	Thales Deutschland GmbH	256
193.58.130.0/23	TESSENDERLO CHEMIE INTERNATIONAL NV	512
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
194.74.80.0/21	Amsterdam	2,048
194.76.40.0/24	BT (Germany) GmbH & Co. OHG	256
194.107.114.0/24	CEVA France SASU	256
194.213.64.0/19	BT Nordics CE WAN links	8,192
195.36.82.0/24	Computacenter AG & Co. oHG, Computacenter Park 1, 50170 Kerpen	256
195.36.104.0/24	COMPUTACENTER FRANCE	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
195.90.64.0/19	atradius_btgsuk	8,192
195.99.64.0/20	PROVIDER	4,096
195.100.0.0/16	British Telecommunications Limited	65,536
195.163.0.0/16	British Telecommunications Limited	65,536
195.171.36.0/22	BT Belgium	1,024
195.182.96.0/19	British Telecommunications Limited	8,192
198.178.236.0/24	KANTAR	256
203.158.68.0/23	BT Global Communication India	512
203.158.72.0/23	BT Global Communication India	512
203.158.76.0/23	BT Global Communication India	512
203.158.88.0/24	BT Global Communication India	256
203.158.89.0/24	BT Global Communication India	256
204.52.188.0/24	KANTAR	256
206.73.0.0/16	INFONET Services Corporation	65,536
206.73.0.0/19	INFONET Services Corporation	8,192
206.73.48.0/20	INFONET Services Corporation	4,096
206.73.80.0/20	INFONET Services Corporation	4,096
206.73.112.0/22	INFONET Services Corporation	1,024
206.73.116.0/22	NALCO	1,024
206.73.156.0/22	INFONET Services Corporation	1,024
212.8.160.0/19	BT-BE_Research	8,192
212.21.192.0/19	amazon	8,192
212.31.192.0/19	Nationale Nederlanden Compaqia de Seguros de Vida NV	8,192
212.41.128.0/19	British Telecommunications Limited	8,192
212.108.0.0/19	tesla_motors_netherlands	8,192
212.127.0.0/19	British Telecommunications Limited	8,192
212.162.192.0/18	British Telecommunications Limited	16,384
213.15.0.0/16	British Telecommunications Limited	65,536
213.137.160.0/19	British Telecommunications Limited	8,192
213.194.0.0/18	British Telecommunications Limited	16,384
213.236.64.0/18	British Telecommunications Limited	16,384
2001:740::/32	British Telecommunications Limited	7.92 × 10²⁸
2402:fb00:8000::/39	Infonet Services Corporation	6.19 × 10²⁶
2402:fb00:8400::/39	Infonet Services Corporation	6.19 × 10²⁶
2402:fb00:8800::/40	Infonet Services Corporation	3.09 × 10²⁶
2402:fb00:c000::/39	Infonet Services Corporation	6.19 × 10²⁶
2402:fb00:c200::/39	Infonet Services Corporation	6.19 × 10²⁶
2606:f100:d000::/39	BT Management Services	6.19 × 10²⁶
2606:f100:d400::/39	BT Management Services	6.19 × 10²⁶
2606:f100:d600::/39	BT Management Services	6.19 × 10²⁶
2606:f100:d800::/38	BT Management Services	1.24 × 10²⁷
2606:f100:dc00::/38	BT Management Services	1.24 × 10²⁷
2606:f100:e400::/39	BT Management Services	6.19 × 10²⁶
2a00:2000::/23	British Telecommunications PLC	4.06 × 10³¹
2a00:2080::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2081::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2082::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2083::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2084::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2086::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2089::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:208a::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:208b::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:208c::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:208d::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2090::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2094::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2095::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2096::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2097::/32	British Telecommunications Limited	7.92 × 10²⁸
2a00:2200::/25	British Telecommunications Limited	1.01 × 10³¹
2a00:2200:200::/40	British Telecommunications Limited	3.09 × 10²⁶
2a00:2200:300::/40	British Telecommunications Limited	3.09 × 10²⁶
2a00:2200:900::/40	British Telecommunications Limited	3.09 × 10²⁶
2a00:2200:b00::/40	British Telecommunications Limited	3.09 × 10²⁶
2a00:2200:d00::/40	British Telecommunications Limited	3.09 × 10²⁶
2a00:2200:2000::/40	British Telecommunications Limited	3.09 × 10²⁶
2a00:2200:5300::/40	British Telecommunications Limited	3.09 × 10²⁶
2a00:2280::/25	British Telecommunications Limited	1.01 × 10³¹
2a00:2300::/25	British Telecommunications PLC	1.01 × 10³¹
2a0c:7c80::/29	Thales Deutschland GmbH	6.34 × 10²⁹

IP ranges are the different blocks of IP addresses advertised by an Autonomous System (AS). These ranges can be used by the same organization operating the AS, or by different organizations.

Peers of AS5400

101 peers

AS42 AS1853 AS2497 AS2906 AS3333 AS174 AS286 AS577 AS680 AS719 AS766 AS1000 AS1120 AS1257 AS1267 AS1273 AS1741 AS1828 AS1836 AS1955 AS2516 AS2686 AS2860 AS3257 AS3303 AS3320 AS3491 AS4181 AS4775 AS5432 AS5511 AS6057 AS6079 AS6453 AS6461 AS6830 AS6939 AS7922 AS8218 AS8283 AS8473 AS9002 AS9498 AS12430 AS12552 AS12741 AS12956 AS13030 AS13335 AS14361 AS14907 AS15412 AS16147 AS19151 AS20485 AS20940 AS21277 AS21320 AS21859 AS23764 AS29119 AS30781 AS31027 AS32590 AS37100 AS37468 AS39737 AS42708 AS49544 AS50304 AS52320 AS52873 AS54994 AS57976 AS58453 AS61568 AS199524 AS263152 AS271253 AS6128 AS6730 AS7713 AS8220 AS8447 AS8881 AS8966 AS9121 AS11164 AS12389 AS24940 AS24961 AS33891 AS35280 AS39351 AS41095 AS43996 AS44444 AS45102 AS60068 AS132203 AS262427

AS5400 peers with these other Autonomous Systems.

Peering is a direct, often free, traffic exchange between Autonomous Systems (ASNs). They share routes only to their own networks and customers, making connections faster and cheaper for that specific traffic, without providing full internet access to each other.

Upstreams of AS5400

5 upstreams

AS1299 AS2914 AS3356 AS4637 AS6762

AS5400 uses these Autonomous Systems as its upstreams.

An upstream (or transit provider) is another AS that AS5400 pays for full internet connectivity, allowing it to reach all global destinations and be reachable by them.

Downstreams of AS5400

60 downstreams

AS72 AS2110 AS2856 AS5091 AS7246 AS7734 AS8590 AS8903 AS8968 AS10780 AS12257 AS12298 AS12331 AS12440 AS12734 AS13130 AS13205 AS15442 AS15466 AS15518 AS16839 AS20561 AS20868 AS21000 AS21433 AS21489 AS22683 AS25049 AS25261 AS26380 AS27311 AS28879 AS29063 AS30614 AS30864 AS31614 AS33873 AS34311 AS34460 AS38191 AS40126 AS40934 AS43033 AS43949 AS48647 AS51046 AS51466 AS51527 AS55290 AS59724 AS60112 AS199541 AS200361 AS202097 AS202666 AS203990 AS206625 AS208053 AS212565 AS394805

AS5400 provides internet connectivity to these downstream Autonomous Systems.

A downstream is a customer Autonomous System that pays another AS (its provider) for internet access. The provider AS carries the downstream's traffic and makes its network reachable.