AS2856 British Telecommunications 🇬🇧 GB

British Telecommunications Limited. Announcing 545 prefixes, seen at the RIS collectors.

IPv4 prefixes

538

18,467,328 (72,138 × /24)

IPv6 prefixes

136 × /32

Upstreams

transit providers observed

Peers

settlement-free adjacencies

Downstreams

148

transit customers observed

Customer cone

152

ASes reachable through it

Registry and operator data

AS number: AS2856
Name: British Telecommunications
Organisation: BTnet (BT's UK IP Network - AS2856)
Country: 🇬🇧 GB
RIR: RIPENCC
Allocated: 1993-12-22
Network type: NSP
Traffic levels: 1-5Tbps
Scope: Regional
Peering policy: Selective
IRR as-set: RIPE::AS-BTGB
Website: http://www.bt.net
PeeringDB: net/281
Exchanges: 2
Facilities: 3

RPKI coverage of this AS

Its own announcements, validated against the current ROA set

388 valid (71.2%) 0 invalid (0.0%) 157 no ROA (28.8%)

Upstreams

Networks seen providing transit to this one

Network	Country	Cone	IPv4 prefixes	Paths	Source
AS5400 British Telecommunications (International)	🇬🇧 GB	307	86	22,061	CAIDA
AS25180 Exponential-E Ltd.	🇬🇧 GB	207	44	22	CAIDA

Peers

Adjacencies that look settlement-free rather than transit

Network	Country	Cone	IPv4 prefixes	Paths	Source
AS9002 RETN Limited	🇬🇧 GB	50,724	19	5,346	CAIDA
AS6461 Zayo Bandwidth	🇺🇸 US	50,626	213	1,632	CAIDA
AS9505 Taiwan Internet Gateway	🇹🇼 TW	20,481	36	1	CAIDA
AS3303 Swisscom (Schweiz) AG	🇨🇭 CH	20,310	345	850	CAIDA
AS13030 Init7 (Switzerland) Ltd.	🇨🇭 CH	327	69	47	CAIDA
AS17639 Converge ICT Solutions Inc.	🇵🇭 PH	272	567	900	CAIDA
AS6206 Netrouting B.V.	🇳🇱 NL	58	46	806	CAIDA
AS50304 Blix Solutions AS	🇳🇴 NO	34	103	1,800	CAIDA
AS48185 team.blue NV	🇧🇪 BE	14	1	952	CAIDA
AS50300 CustodianDC Limited	🇬🇧 GB	9	39	905	CAIDA

Downstreams

Networks this one appears to provide transit to

Network	Country	Cone	IPv4 prefixes	Paths	Source
AS28690 Barclays Bank PLC	🇬🇧 GB	3	50	190	CAIDA
AS19305 Transaction Network Services, Inc.	🇺🇸 US	3	14	41	CAIDA
AS36224 HCL AMERICA INC	🇺🇸 US	2	95	164	CAIDA
AS12440 Hughes Network Systems GmbH	🇩🇪 DE	2	20	71	CAIDA
AS29033 Eckoh UK Limited	🇬🇧 GB	2	2	56	CAIDA
AS33680 TELEPERFORMANCE USA	🇺🇸 US	2	22	41	CAIDA
AS6871 Plusnet plc	🇬🇧 GB	0	61	2,567	CAIDA
AS2134 Santander Global Technology and Operations, S.L.	🇪🇸 ES	0	132	697	CAIDA
AS54113 Fastly, Inc.	🇺🇸 US	0	605	592	CAIDA
AS49318 TELEFONICA TECH UK MANAGED SERVICES LTD	🇬🇧 GB	0	30	574	CAIDA
AS201536 SANDYX SYSTEMS LIMITED	🇬🇧 GB	0	9	525	CAIDA
AS25049 Shell Information Technology International B.V.	🇳🇱 NL	0	12	328	CAIDA
AS3573 Accenture LLP	🇺🇸 US	0	116	267	inferred
AS21369 Atos IT Services UK Ltd	🇬🇧 GB	0	46	258	CAIDA
AS202206 FAT MEDIA LTD	🇬🇧 GB	0	7	245	CAIDA
AS199675 Willis Group Services Ltd	🇬🇧 GB	0	5	205	CAIDA
AS28863 Thales UK Limited	🇬🇧 GB	0	5	205	CAIDA
AS15248 Metaswitch Networks Corp.	🇺🇸 US	0	4	173	CAIDA
AS35707 Scottish Power UK PLC	🇬🇧 GB	0	5	171	CAIDA
AS57002 William Hill Organization Ltd	🇬🇧 GB	0	22	169	CAIDA
AS39550 KPMG LLP	🇬🇧 GB	0	4	164	CAIDA
AS198386 THRIVE OPERATIONS LIMITED	🇬🇧 GB	0	4	158	CAIDA
AS14931 The St. Paul Travelers Companies, Inc.	🇺🇸 US	0	6	156	CAIDA
AS212329 Netcraft Ltd	🇬🇧 GB	0	2	148	CAIDA
AS20705 HSBC Bank plc	🇬🇧 GB	0	28	133	CAIDA
AS206237 Barclays Bank PLC	🇬🇧 GB	0	7	129	CAIDA
AS39552 WBA (IT Services) International Limited	🇬🇧 GB	0	3	123	CAIDA
AS205114 The WEST Retail group LImited	🇬🇧 GB	0	5	123	CAIDA
AS212565 Specsavers Optical Group Limited	🇬🇬 GG	0	8	123	CAIDA
AS16525 KBR	🇺🇸 US	0	9	123	CAIDA
AS197545 Era4 Limited	🇬🇧 GB	0	2	105	inferred
AS17903 Cognizant Technology Solutions India Pvt Ltd,	🇮🇳 IN	0	97	82	CAIDA
AS19428 Phillips 66 Company	🇺🇸 US	0	17	82	CAIDA
AS60962 Foreign and Commonwealth Office	🇬🇧 GB	0	3	82	CAIDA
AS15499 Computacenter Management GmbH trading as Computacenter AG & Co.oHG	🇩🇪 DE	0	3	82	CAIDA
AS15141 Bausch & Lomb	🇺🇸 US	0	4	82	CAIDA
AS48549 Bringo Group Ltd	🇬🇧 GB	0	6	82	CAIDA
AS206024 RELX GROUP PLC	🇬🇧 GB	0	2	82	CAIDA
AS43259 Leidos Innovations UK LTD	🇬🇧 GB	0	2	82	CAIDA
AS209761 North of England Commissioning Support Unit	🇬🇧 GB	0	3	82	CAIDA
AS211077 UK Home Office (The Secretary of State for the Home Department)	🇬🇧 GB	0	2	82	CAIDA
AS213786 IDASH SOLUTIONS LIMITED	🇬🇧 GB	0	1	82	inferred
AS33981 Total System Services Processing Europe Limited	🇬🇧 GB	0	2	82	CAIDA
AS204550 Continental Limited	🇬🇧 GB	0	2	80	CAIDA
AS11939 THE MATHWORKS, INC.	🇺🇸 US	0	25	76	CAIDA
AS394731 Canadian Natural Resources Limited	🇨🇦 CA	0	2	76	CAIDA
AS14766 Magnetar Capital LLC	🇺🇸 US	0	1	74	CAIDA
AS59451 Al-Bank Al-Arabi PLC. CO.	🇯🇴 JO	0	10	72	CAIDA
AS19812 Transaction Network Services, Inc.	🇺🇸 US	0	16	72	CAIDA
AS205693 Driver & Vehicle Licensing Agency	🇬🇧 GB	0	4	72	CAIDA
AS50203 Reynolds and Reynolds Limited	🇬🇧 GB	0	3	69	CAIDA
AS22775 Moore Capital Management	🇺🇸 US	0	10	67	CAIDA
AS206051 ARAMARK N.V	🇧🇪 BE	0	2	67	CAIDA
AS15865 Elliott Advisors UK (Ltd)	🇬🇧 GB	0	2	51	CAIDA
AS41570 BFBS	🇬🇧 GB	0	2	46	CAIDA
AS393414 Kirkland & Ellis LLP	🇺🇸 US	0	2	44	CAIDA
AS33127 Integrated Systems Corp	🇺🇸 US	0	9	44	CAIDA
AS2535 BP America, Inc.	🇺🇸 US	0	13	41	CAIDA
AS218625 Communication Dynamics Ltd	🇬🇧 GB	0	1	41	inferred
AS33442 Zebra Technologies Corporation	🇺🇸 US	0	26	41	CAIDA
AS53926 Apache Corporation	🇺🇸 US	0	4	41	CAIDA
AS51953 Sagentia Ltd	🇬🇧 GB	0	1	41	CAIDA
AS199262 Transport for London	🇬🇧 GB	0	1	41	CAIDA
AS20163 Sunrise Medical, Inc.	🇺🇸 US	0	2	41	CAIDA
AS213885 Wilxite Ltd	🇬🇧 GB	0	1	41	CAIDA
AS29888 Unum Group	🇺🇸 US	0	15	41	CAIDA
AS63112 Service-now.com	🇺🇸 US	0	3	41	CAIDA
AS41373 NATIONAL HEALTH SERVICE	🇬🇧 GB	0	1	41	CAIDA
AS41380 Ald Automotive Ltd	🇬🇧 GB	0	1	41	CAIDA
AS211015 UK Home Office (The Secretary of State for the Home Department)	🇬🇧 GB	0	1	41	CAIDA
AS210988 London Borough Of Hammersmith & Fulham	🇬🇧 GB	0	1	41	CAIDA
AS42536 Deloitte LLP	🇬🇧 GB	0	1	41	CAIDA
AS25343 Coventry University	🇬🇧 GB	0	1	41	CAIDA
AS209997 SECURITAS TECHNOLOGY LIMITED	🇬🇧 GB	0	1	41	CAIDA
AS21110 Entain Corporate Services Limited	🇬🇮 GI	0	3	41	CAIDA
AS44480 Brevan Howard Asset Management LLP	🇬🇧 GB	0	2	41	CAIDA
AS207273 Pharoah Tools Limited	🇬🇧 GB	0	1	41	CAIDA
AS131993 UNIT 107 MULTISTORIED BUILDING, SEEPZ,	🇮🇳 IN	0	4	41	CAIDA
AS21218 EBC Group (UK) Ltd	🇬🇧 GB	0	1	41	CAIDA
AS11528 Photronics Inc.	🇺🇸 US	0	10	41	CAIDA
AS13205 British Telecommunications Limited	🇬🇧 GB	0	14	41	CAIDA
AS203133 Optimas OE Solutions LTD	🇬🇧 GB	0	1	41	CAIDA
AS21758 Modine Manufacturing Company	🇺🇸 US	0	6	41	CAIDA
AS200961 FIL INVESTMENT MANAGEMENT LIMITED	🇬🇧 GB	0	8	41	CAIDA
AS17274 Robert W. Baird & Co. Incorporated	🇺🇸 US	0	6	41	CAIDA
AS38936 Herman Miller LTD	🇬🇧 GB	0	1	40	CAIDA
AS41839 Concentrix Europe Limited	🇬🇧 GB	0	2	40	CAIDA
AS209258 TSYS Europe (Netherlands) B.V.	🇳🇱 NL	0	1	39	CAIDA
AS38191 Infosys Technologies Ltd	🇮🇳 IN	0	56	39	CAIDA
AS50826 Moelis & Company UK LLP	🇬🇧 GB	0	1	38	CAIDA
AS9011 The Patent Office	🇬🇧 GB	0	9	38	CAIDA
AS59345 CME Group Singapore Operations Pte Ldt.	🇸🇬 SG	0	3	36	CAIDA
AS11031 Orbis Investments (Canada) Limited	🇨🇦 CA	0	11	35	CAIDA
AS5091 Stripe, Inc.	🇺🇸 US	0	19	35	CAIDA
AS47113 Suffolk Life Pensions Limited	🇬🇧 GB	0	1	32	CAIDA
AS16477 Nielsen Consumer LLC	🇺🇸 US	0	21	32	CAIDA
AS206467 Protech Communications Ltd	🇬🇧 GB	0	3	31	CAIDA
AS25050 VOCALINK LTD	🇬🇧 GB	0	1	31	CAIDA
AS213867 TENERITY LIMITED	🇬🇧 GB	0	4	27	CAIDA
AS19239 KLA Corporation	🇺🇸 US	0	15	25	CAIDA
AS47534 VOCALINK LTD	🇬🇧 GB	0	1	24	CAIDA
AS8435 Lloyds Banking Group PLC	🇬🇧 GB	0	47	23	CAIDA
AS207552 Cambridge Consultants Limited	🇬🇧 GB	0	1	23	CAIDA
AS25421 John Lewis Plc.	🇬🇧 GB	0	9	22	CAIDA
AS24775 Qinetiq Limited	🇬🇧 GB	0	2	22	CAIDA
AS202907 Atomic IT Limited	🇬🇧 GB	0	1	22	CAIDA
AS395959 XEROX CORPORATION	🇺🇸 US	0	7	21	CAIDA
AS56644 Fundtech Financial Messaging Ltd	🇬🇧 GB	0	2	21	CAIDA
AS211389 Briant Broadband Limited	🇬🇧 GB	0	6	20	CAIDA
AS41988 TAKING CARE PERSONAL ALARMS LIMITED	🇬🇧 GB	0	1	19	CAIDA
AS44371 Paypoint Network Limited	🇬🇧 GB	0	6	18	CAIDA
AS206146 PAYSEND TECHNOLOGY LIMITED	🇬🇧 GB	0	1	18	CAIDA
AS8336 THE INNOVATION GROUP (EMEA) LTD	🇬🇧 GB	0	3	16	CAIDA
AS60925 BPP Services Limited	🇬🇧 GB	0	1	13	CAIDA
AS206686 Nominet UK	🇬🇧 GB	0	4	13	CAIDA
AS55290 Depository Trust & Clearing Corporation	🇺🇸 US	0	24	13	CAIDA
AS33001 Cravath, Swaine & Moore LLP	🇺🇸 US	0	6	13	CAIDA
AS16839 SERVICENOW, INC.	🇺🇸 US	0	113	12	CAIDA
AS21054 Natwest Markets PLC	🇬🇧 GB	0	13	12	CAIDA
AS48688 Thales UK Ltd	🇬🇧 GB	0	4	12	CAIDA
AS59445 ICC NETWORKS LTD	🇬🇧 GB	0	3	12	CAIDA
AS20464 HP Inc.	🇺🇸 US	0	23	12	CAIDA
AS50948 AMDOCS (UK) LIMITED	🇬🇧 GB	0	6	11	CAIDA
AS60339 Hutchison 3G UK Limited	🇬🇧 GB	0	1	11	CAIDA
AS3738 State Street Bank and Trust Company	🇺🇸 US	0	87	11	CAIDA
AS204322 New York Times Limited	🇬🇧 GB	0	1	10	CAIDA
AS21301 Natwest Markets PLC	🇬🇧 GB	0	12	10	CAIDA
AS14630 Invesco Group Services, Inc.	🇺🇸 US	0	31	10	CAIDA
AS394265 Box.com	🇺🇸 US	0	6	10	CAIDA
AS21470 South West Communications Group Ltd	🇬🇧 GB	0	2	8	CAIDA
AS21464 EDF Trading Ltd	🇬🇧 GB	0	1	8	CAIDA
AS211303 Electronic Arts Limited	🇬🇧 GB	0	1	8	CAIDA
AS31003 Iron Mountain Europe (Group) Limited	🇬🇧 GB	0	2	8	CAIDA
AS207087 Pay360 Ltd	🇬🇧 GB	0	5	8	CAIDA
AS39957 Perella Weinberg Partners GP LLC	🇺🇸 US	0	4	8	CAIDA
AS63399 Dialpad, Inc.	🇺🇸 US	0	35	8	CAIDA
AS206166 Schroder Investment Management Limited	🇬🇧 GB	0	2	6	CAIDA
AS44268 J.C. BAMFORD EXCAVATORS LIMITED	🇬🇧 GB	0	1	5	CAIDA
AS33879 Forth Ports Public Limited Company	🇬🇧 GB	0	1	5	CAIDA
AS34344 Port Of Tilbury London Ltd	🇬🇧 GB	0	3	5	inferred
AS7358 The Dun & Bradstreet Corporation	🇺🇸 US	0	6	4	CAIDA
AS8698 NATIONWIDE BUILDING SOCIETY	🇬🇧 GB	0	109	4	CAIDA
AS35350 UCB Pharma S.A.	🇧🇪 BE	0	4	4	CAIDA
AS201529 Orchid Cellmark Ltd	🇬🇧 GB	0	1	3	CAIDA
AS201528 Orchid Cellmark Ltd	🇬🇧 GB	0	1	3	CAIDA
AS56745 Kalnet4u Ltd	🇬🇧 GB	0	1	2	CAIDA
AS202466 QBE Management Services (UK) Limited	🇬🇧 GB	0	5	2	CAIDA
AS44617 HBK EUROPE MANAGEMENT LLP	🇬🇧 GB	0	1	1	CAIDA

Relationships marked inferred come from where the two networks sit on the AS paths the collectors see, which is a guess and is wrong for some of them. The rest are stated by CAIDA's published inference over a much wider set of collectors.