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AS2856

BT-UK-AS

BTnet UK Regional network

Registry

Authoritative registration data

AS number
2856
Name
BT-UK-AS
Organisation
BTnet UK Regional network
Country
—
RIR
RIPE
Registered
Source:asn:rdap retrieved

IPv4 prefixes

545

IPv6 prefixes

7

Total announced

552

Announced prefixes

Observed in BGP by route collectors, not a registry allocation list

Prefixes announced by AS2856
86.128.0.0/10 IPv4 /10 not checked
81.128.0.0/11 IPv4 /11 not checked
86.128.0.0/11 IPv4 /11 not checked
109.144.0.0/12 IPv4 /12 not checked
217.32.0.0/12 IPv4 /12 not checked
81.128.0.0/12 IPv4 /12 not checked
86.128.0.0/12 IPv4 /12 not checked
31.48.0.0/13 IPv4 /13 not checked
95.144.0.0/13 IPv4 /13 not checked
147.148.0.0/14 IPv4 /14 not checked
194.72.0.0/14 IPv4 /14 not checked
213.120.0.0/14 IPv4 /14 not checked
31.100.0.0/14 IPv4 /14 not checked
31.112.0.0/14 IPv4 /14 not checked
31.116.0.0/14 IPv4 /14 not checked
109.180.0.0/15 IPv4 /15 not checked
31.106.0.0/15 IPv4 /15 not checked
31.122.0.0/15 IPv4 /15 not checked
31.126.0.0/15 IPv4 /15 not checked
31.90.0.0/15 IPv4 /15 not checked
31.92.0.0/15 IPv4 /15 not checked
46.68.0.0/15 IPv4 /15 not checked
5.80.0.0/15 IPv4 /15 not checked
109.249.0.0/16 IPv4 /16 not checked
132.146.0.0/16 IPv4 /16 not checked
147.152.0.0/16 IPv4 /16 not checked
149.254.0.0/16 IPv4 /16 not checked
165.120.0.0/16 IPv4 /16 not checked
193.113.0.0/16 IPv4 /16 not checked
195.171.0.0/16 IPv4 /16 not checked
195.99.0.0/16 IPv4 /16 not checked
212.140.0.0/16 IPv4 /16 not checked
213.1.0.0/16 IPv4 /16 not checked
31.104.0.0/16 IPv4 /16 not checked
31.116.0.0/16 IPv4 /16 not checked
31.117.0.0/16 IPv4 /16 not checked
31.118.0.0/16 IPv4 /16 not checked
31.119.0.0/16 IPv4 /16 not checked
31.120.0.0/16 IPv4 /16 not checked
31.121.0.0/16 IPv4 /16 not checked
31.124.0.0/16 IPv4 /16 not checked
31.94.0.0/16 IPv4 /16 not checked
31.96.0.0/16 IPv4 /16 not checked
5.81.0.0/16 IPv4 /16 not checked
51.14.0.0/16 IPv4 /16 not checked
62.172.0.0/16 IPv4 /16 not checked
62.239.0.0/16 IPv4 /16 not checked
62.6.0.0/16 IPv4 /16 not checked
62.7.0.0/16 IPv4 /16 not checked
91.111.0.0/16 IPv4 /16 not checked
144.87.128.0/17 IPv4 /17 not checked
213.205.192.0/18 IPv4 /18 not checked
9.232.192.0/18 IPv4 /18 not checked
9.237.128.0/18 IPv4 /18 not checked
159.180.96.0/19 IPv4 /19 not checked
193.38.192.0/19 IPv4 /19 not checked
194.102.0.0/19 IPv4 /19 not checked
195.218.32.0/19 IPv4 /19 not checked
212.82.0.0/19 IPv4 /19 not checked
84.23.0.0/19 IPv4 /19 not checked
9.151.0.0/19 IPv4 /19 not checked
9.237.192.0/19 IPv4 /19 not checked
9.237.96.0/19 IPv4 /19 not checked
144.87.0.0/20 IPv4 /20 not checked
144.87.16.0/20 IPv4 /20 not checked
193.35.128.0/20 IPv4 /20 not checked
193.37.160.0/20 IPv4 /20 not checked
213.205.208.0/20 IPv4 /20 not checked
217.15.64.0/20 IPv4 /20 not checked
51.230.0.0/20 IPv4 /20 not checked
51.230.112.0/20 IPv4 /20 not checked
51.230.16.0/20 IPv4 /20 not checked
51.230.32.0/20 IPv4 /20 not checked
51.230.48.0/20 IPv4 /20 not checked
51.230.64.0/20 IPv4 /20 not checked
51.230.80.0/20 IPv4 /20 not checked
51.230.96.0/20 IPv4 /20 not checked
85.88.224.0/20 IPv4 /20 not checked
87.81.112.0/20 IPv4 /20 not checked
9.151.208.0/20 IPv4 /20 not checked
9.233.48.0/20 IPv4 /20 not checked
94.192.96.0/20 IPv4 /20 not checked
94.193.112.0/20 IPv4 /20 not checked
144.87.24.0/21 IPv4 /21 not checked
161.104.0.0/21 IPv4 /21 not checked
178.78.112.0/21 IPv4 /21 not checked
178.78.120.0/21 IPv4 /21 not checked
188.172.160.0/21 IPv4 /21 not checked
188.172.168.0/21 IPv4 /21 not checked
194.169.32.0/21 IPv4 /21 not checked
5.35.192.0/21 IPv4 /21 not checked
82.108.32.0/21 IPv4 /21 not checked
83.245.16.0/21 IPv4 /21 not checked
87.237.16.0/21 IPv4 /21 not checked
9.151.248.0/21 IPv4 /21 not checked
94.72.248.0/21 IPv4 /21 not checked
144.87.24.0/22 IPv4 /22 not checked
144.87.28.0/22 IPv4 /22 not checked
145.79.172.0/22 IPv4 /22 not checked
147.189.68.0/22 IPv4 /22 not checked
147.189.76.0/22 IPv4 /22 not checked
147.78.68.0/22 IPv4 /22 not checked
15.145.20.0/22 IPv4 /22 not checked
151.240.180.0/22 IPv4 /22 not checked
151.240.184.0/22 IPv4 /22 not checked
151.240.188.0/22 IPv4 /22 not checked
151.240.192.0/22 IPv4 /22 not checked
151.240.196.0/22 IPv4 /22 not checked
151.240.200.0/22 IPv4 /22 not checked
151.241.180.0/22 IPv4 /22 not checked
151.241.184.0/22 IPv4 /22 not checked
151.241.188.0/22 IPv4 /22 not checked
151.241.192.0/22 IPv4 /22 not checked
151.241.196.0/22 IPv4 /22 not checked
151.241.200.0/22 IPv4 /22 not checked
151.241.52.0/22 IPv4 /22 not checked
151.241.56.0/22 IPv4 /22 not checked
151.241.60.0/22 IPv4 /22 not checked
151.244.204.0/22 IPv4 /22 not checked
151.244.208.0/22 IPv4 /22 not checked
151.244.80.0/22 IPv4 /22 not checked
151.245.204.0/22 IPv4 /22 not checked
151.245.208.0/22 IPv4 /22 not checked
151.245.80.0/22 IPv4 /22 not checked
164.38.120.0/22 IPv4 /22 not checked
164.38.16.0/22 IPv4 /22 not checked
164.38.184.0/22 IPv4 /22 not checked
167.148.60.0/22 IPv4 /22 not checked
178.78.108.0/22 IPv4 /22 not checked
178.92.112.0/22 IPv4 /22 not checked
178.92.180.0/22 IPv4 /22 not checked
178.93.104.0/22 IPv4 /22 not checked
178.94.244.0/22 IPv4 /22 not checked
178.95.60.0/22 IPv4 /22 not checked
185.68.200.0/22 IPv4 /22 not checked
185.90.32.0/22 IPv4 /22 not checked
193.187.140.0/22 IPv4 /22 not checked
193.35.220.0/22 IPv4 /22 not checked
193.36.80.0/22 IPv4 /22 not checked
193.38.192.0/22 IPv4 /22 not checked
194.32.20.0/22 IPv4 /22 not checked
212.134.124.0/22 IPv4 /22 not checked
212.134.164.0/22 IPv4 /22 not checked
212.134.208.0/22 IPv4 /22 not checked
212.134.224.0/22 IPv4 /22 not checked
212.212.16.0/22 IPv4 /22 not checked
213.249.188.0/22 IPv4 /22 not checked
217.217.36.0/22 IPv4 /22 not checked
217.217.56.0/22 IPv4 /22 not checked
217.217.60.0/22 IPv4 /22 not checked
37.143.0.0/22 IPv4 /22 not checked
37.97.112.0/22 IPv4 /22 not checked
46.248.120.0/22 IPv4 /22 not checked
46.248.96.0/22 IPv4 /22 not checked
51.146.128.0/22 IPv4 /22 not checked
51.146.136.0/22 IPv4 /22 not checked
51.146.252.0/22 IPv4 /22 not checked
51.146.44.0/22 IPv4 /22 not checked
51.194.100.0/22 IPv4 /22 not checked
64.205.136.0/22 IPv4 /22 not checked
64.205.144.0/22 IPv4 /22 not checked
72.9.180.0/22 IPv4 /22 not checked
78.105.136.0/22 IPv4 /22 not checked
81.161.52.0/22 IPv4 /22 not checked
82.108.116.0/22 IPv4 /22 not checked
82.108.140.0/22 IPv4 /22 not checked
82.108.4.0/22 IPv4 /22 not checked
82.108.44.0/22 IPv4 /22 not checked
82.108.52.0/22 IPv4 /22 not checked
82.108.68.0/22 IPv4 /22 not checked
82.108.92.0/22 IPv4 /22 not checked
82.38.56.0/22 IPv4 /22 not checked
82.41.112.0/22 IPv4 /22 not checked
83.245.24.0/22 IPv4 /22 not checked
85.204.160.0/22 IPv4 /22 not checked
87.86.248.0/22 IPv4 /22 not checked
94.194.188.0/22 IPv4 /22 not checked
94.194.200.0/22 IPv4 /22 not checked
94.194.204.0/22 IPv4 /22 not checked
94.194.240.0/22 IPv4 /22 not checked
94.232.100.0/22 IPv4 /22 not checked
142.205.162.0/23 IPv4 /23 not checked
144.177.74.0/23 IPv4 /23 not checked
148.253.220.0/23 IPv4 /23 not checked
152.114.220.0/23 IPv4 /23 not checked
152.114.222.0/23 IPv4 /23 not checked
157.236.254.0/23 IPv4 /23 not checked
159.253.66.0/23 IPv4 /23 not checked
178.212.56.0/23 IPv4 /23 not checked
178.78.106.0/23 IPv4 /23 not checked
185.177.64.0/23 IPv4 /23 not checked
192.177.94.0/23 IPv4 /23 not checked
193.35.158.0/23 IPv4 /23 not checked
193.35.160.0/23 IPv4 /23 not checked
193.36.78.0/23 IPv4 /23 not checked
193.38.192.0/23 IPv4 /23 not checked
193.38.194.0/23 IPv4 /23 not checked
194.189.186.0/23 IPv4 /23 not checked
205.239.40.0/23 IPv4 /23 not checked
209.101.8.0/23 IPv4 /23 not checked
213.169.196.0/23 IPv4 /23 not checked
213.169.202.0/23 IPv4 /23 not checked
213.190.16.0/23 IPv4 /23 not checked
213.190.18.0/23 IPv4 /23 not checked
217.31.10.0/23 IPv4 /23 not checked
23.230.82.0/23 IPv4 /23 not checked
31.130.240.0/23 IPv4 /23 not checked
45.149.168.0/23 IPv4 /23 not checked
45.149.170.0/23 IPv4 /23 not checked
46.248.102.0/23 IPv4 /23 not checked
46.248.104.0/23 IPv4 /23 not checked
50.118.154.0/23 IPv4 /23 not checked
51.194.36.0/23 IPv4 /23 not checked
62.192.124.0/23 IPv4 /23 not checked
79.139.52.0/23 IPv4 /23 not checked
79.139.54.0/23 IPv4 /23 not checked
82.108.102.0/23 IPv4 /23 not checked
82.108.152.0/23 IPv4 /23 not checked
82.108.88.0/23 IPv4 /23 not checked
82.136.54.0/23 IPv4 /23 not checked
85.189.132.0/23 IPv4 /23 not checked
85.189.154.0/23 IPv4 /23 not checked
85.189.164.0/23 IPv4 /23 not checked
85.189.174.0/23 IPv4 /23 not checked
85.189.190.0/23 IPv4 /23 not checked
85.189.72.0/23 IPv4 /23 not checked
85.189.74.0/23 IPv4 /23 not checked
85.189.76.0/23 IPv4 /23 not checked
85.189.78.0/23 IPv4 /23 not checked
85.88.240.0/23 IPv4 /23 not checked
87.86.24.0/23 IPv4 /23 not checked
89.145.172.0/23 IPv4 /23 not checked
89.39.172.0/23 IPv4 /23 not checked
91.236.216.0/23 IPv4 /23 not checked
94.26.64.0/23 IPv4 /23 not checked
109.205.158.0/24 IPv4 /24 not checked
132.153.244.0/24 IPv4 /24 not checked
132.153.245.0/24 IPv4 /24 not checked
132.153.246.0/24 IPv4 /24 not checked
132.153.247.0/24 IPv4 /24 not checked
132.153.248.0/24 IPv4 /24 not checked
132.153.249.0/24 IPv4 /24 not checked
132.153.250.0/24 IPv4 /24 not checked
132.153.251.0/24 IPv4 /24 not checked
132.153.252.0/24 IPv4 /24 not checked
132.153.253.0/24 IPv4 /24 not checked
132.153.254.0/24 IPv4 /24 not checked
132.153.3.0/24 IPv4 /24 not checked
132.244.79.0/24 IPv4 /24 not checked
138.108.94.0/24 IPv4 /24 not checked
2a00:2380::/25 IPv6 /25 RPKI valid
2a01:4c8::/29 IPv6 /29 not checked
2a02:ee80:4176::/47 IPv6 /47 RPKI not found
2001:4878:c259::/48 IPv6 /48 not checked
2a01:4c8:f400::/48 IPv6 /48 not checked
2a01:4c8:f401::/48 IPv6 /48 not checked
2a03:1e82:90ff::/48 IPv6 /48 not checked

No rows match “”.

Showing – of

Source:ripestat:announced-prefixes observed

257 of 552 announced prefixes, least specific first.

Internet Exchanges

Exchanges where this network has a listed peering LAN connection

Internet Exchange memberships listed for AS2856
Address families
LINX LON1: Main 500,000 Mbps IPv4 · IPv6
LINX LON2 200,000 Mbps IPv4 · IPv6

No rows match “”.

Showing – of

Source:peeringdb retrieved

Exchange membership means the network has a listed connection; it does not prove peering with other members.

Observed adjacencies

Networks seen next to AS2856 in BGP paths by route collectors.

Source:ripestat:asn-neighbours observed

Observed upstreams

20 networks seen before AS2856 in AS paths

Observed upstreams
Families
AS5400 BT 17,426 159,239
v4 v6
AS9002 RETN-AS 2,958 28,239
v4 v6
AS6461 ZAYO-6461 939 9,502
v4 v6
AS13030 INIT7 857 7,288
v4 v6
AS3303 SWISSCOM 651 5,911
v4 v6
AS5405 INTERDOTLINK 577 5,215
v4 v6
AS60068 CDN77 281 2,856
v4 v6
AS50304 BLIX 409 2,735
v4 v6
AS4455 BSO 227 2,563
v4 v6
AS8220 COLT 141 1,535
v4 v6
AS1267 ASN-WINDTRE 110 1,383
v4
AS6204 ZET-NET 145 919
v4
AS9009 M247 118 904
v4 v6
AS137409 GSLNETWORKS-AS-AP 105 866
v4 v6
AS30844 LIQUID-AS 114 860
v4 v6
AS6206 NETROUTING-AS 95 812
v4
AS9505 TWGATE-AP 97 801
v4
AS25180 EXPONENTIAL-E-AS 50 114
v4
AS8966 Etisalat-AS 9 38
v4 v6
AS48101 TROOLI-AS 1 1
v6

No rows match “”.

Showing – of

Observed downstreams

100 networks seen after AS2856 in AS paths

Observed downstreams
Families
AS6871 Plusnet 321 17,316
v4 v6
AS2134 GSVNET-AS 234 4,675
v4
AS54113 FASTLY 320 4,368
v4 v6
AS49318 ARC-AS-UK 243 3,850
v4
AS201536 SANDYXHOSTING-AS 302 3,819
v4 v6
AS15248 METASWITCH-AS1 557 2,434
v4 v6
AS25049 STASCO-UK-AS 460 2,198
v4
AS3573 ACCENTURE 237 2,166
v6
AS21369 SEMA-UK-AS 184 1,633
v4
AS202206 MOTIVE 196 1,525
v4
AS28863 Thales-SCS 240 1,375
v4
AS199675 WGSLEDC 233 1,375
v4
AS57002 WHORGLTD 310 1,134
v4
AS35707 Scottish-Power-PLC 221 1,121
v4
AS36224 HCLTA94085 240 1,100
v4
AS39550 KPMG-UK-LLP-AS 457 1,088
v4
AS212329 NETCRAFT 321 1,088
v4 v6
AS14931 STA-AS 236 1,065
v4
AS28690 ING-DIRECT-UK 102 1,064
v4
AS198386 ONI 229 1,062
v4
AS20705 HSBC-UK 66 995
v4 v6
AS206237 BARCLAYS_BPS 252 848
v4
AS39552 AHR-AS 237 825
v4
AS212565 SPECSAVERS 236 825
v4
AS16525 KBR 231 825
v4
AS205114 wrtgltd 230 819
v4
AS12440 AS12440 176 613
v4
AS204550 continental-ltd 283 603
v4 v6
AS394731 CNRL 315 556
v4 v6
AS209761 NECS 239 550
v4
AS15141 ASN-BAUSCH-LOMB 236 550
v4
AS60962 BZ 236 550
v4
AS43259 LEIDOS-UK 235 550
v4
AS17903 COGNIZANT-IN-AP 232 550
v4
AS206024 Far-UK-DualHoming 232 550
v4
AS48549 BRINGOGROUP 231 550
v4
AS213786 460 549
v4
AS19428 PHILLIPS-66 244 549
v4
AS33981 TSYS-AS 459 548
v4
AS218625 235 548
v4
AS15499 GECITS-EU 235 546
v4
AS10235 NAB-AS-AP 231 546
v4
AS211077 HO-LECN-DC01 229 546
v4
AS197545 Era4-ASN 317 545
v4 v6
AS14766 UKMAGDIA-BT-LUM 445 543
v4 v6
AS205693 dvla 148 506
v4
AS11939 MATHWORKS 233 500
v4
AS206051 ARAMARK-IE 301 492
v4 v6
AS50203 UK-Reynolds-ASN 134 471
v4
AS59451 ARABBANK-AS 202 466
v4
AS22775 MOORECAP 231 421
v4
AS29033 ECKOH 235 400
v4 v6
AS15865 ELLIOTT-UK-AS 217 331
v4
AS33127 ISCORP-MEQUON 239 329
v4 v6
AS41570 SSVC-AS 258 310
v4
AS9011 UNSPECIFIED 244 306
v4 v6
AS21301 68 287
v4
AS13447 QYRUS-INC 231 275
v4
AS44480 Brevan-Howard-AS 231 275
v4
AS207273 PHAROAH-AS 231 275
v4
AS2535 BP 230 275
v4
AS11528 PHOTRONICS 230 275
v4
AS13205 UNSPECIFIED 230 275
v4
AS17274 RWBAIRD 230 275
v4
AS19305 230 275
v4
AS20163 SUNMED 230 275
v4
AS21110 LADBROKES-UK 230 275
v4
AS21218 EBCGROUP 230 275
v4
AS21758 MODINE-MANUFACTURING 230 275
v4
AS25343 COVENTRY-AS 230 275
v4
AS29888 UNUMGROUP-AS 230 275
v4
AS33442 ZEBRA-TECHNOLOGIES-BGP-AS-NUMBER 230 275
v4
AS33680 TELEPERFORMANCE-USA 230 275
v4
AS41373 BT-Plc 230 275
v4
AS41380 ALD-AS 230 275
v4
AS51953 sciencegroup-uk 230 275
v4
AS53926 APA-US-ASN 230 275
v4
AS131993 QUINNOX-IN 230 275
v4
AS199262 TfL-FPS-AS 230 275
v4
AS200961 FWI2-ASN 230 275
v4
AS203133 Optimas_UK 230 275
v4
AS209997 securitas-uk-as-sms 230 275
v4
AS210988 LBHF 230 275
v4
AS213885 WXTANGO-MNT 230 275
v4
AS38936 HMUK-AS 229 274
v4
AS42536 Deloitte-UK 229 274
v4
AS63112 SERVICENOW-CORP 229 274
v4
AS41839 ConcentrixEuropeLtd 229 273
v4
AS211015 HO-LECN-DC02 227 271
v4
AS209258 TSYSI 226 269
v4
AS50826 Moelis-and-Company-UK-LLP 219 262
v4
AS393414 KIRKLAND-ELLIS-UK 192 251
v4
AS5091 STRIPE 197 230
v4
AS59345 CGSOPL-AS 191 224
v4
AS25050 BACS-AS 177 209
v4
AS47113 SLP 167 196
v4
AS2559 VISANET-1 38 195
v4
AS8435 LBG_INTERNET_EDGE 66 190
v4
AS11031 ORBIS-INVESTMENTS 161 188
v4
AS206467 PROTECH-COMMS 154 185
v4

No rows match “”.

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Uncertain adjacencies

10 adjacencies that may be an artefact of collector peering

Uncertain adjacencies
Families
AS199524 GCORE 151 1,004
v4 v6
AS6667 EUNET-FINLAND 129 988
v4 v6
AS48185 team_blue 145 969
v4 v6
AS51185 MAINSTREAMING-AS 125 940
v4 v6
AS49544 i3Dnet 120 926
v4 v6
AS50300 CUSTDC 134 916
v4
AS36236 NETACTUATE 120 912
v4 v6
AS17639 CONVERGE-AS 121 909
v4 v6
AS8426 CLARANET-AS 116 895
v4 v6
AS13237 LAMBDANET-AS 123 862
v4

No rows match “”.

Showing – of

Note:
These are observed adjacencies derived from BGP path data, not confirmed commercial relationships. A network appearing before another in an AS path does not establish that it is a paying transit customer, a settlement free peer, or anything else contractual. Adjacencies marked uncertain were seen only as direct peers of a route collector, so the collector's own peering may have created them.