ResearchRouting table, RPKI, IRR & looking glass

AS2856 British Telecommunications Limited

AS2856 (BT-UK-AS) is registered to British Telecommunications Limited in GB, through RIPE. It originates 548 prefixes in the global routing table.

541
IPv4 prefixes
7
IPv6 prefixes
13,938,432
IPv4 addresses
71%
RPKI valid
Registration

Who holds AS2856

Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.

AS number
AS2856
Handle
BT-UK-AS
Organization
British Telecommunications Limited
Country
GB
Registry
RIPE
ASPA
None published
WHOIS recordRIPE
% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to 'AS2830 - AS2879'

as-block:       AS2830 - AS2879
descr:          RIPE NCC ASN block
remarks:        These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by:         RIPE-NCC-HM-MNT
created:        2018-11-22T15:27:18Z
last-modified:  2018-11-22T15:27:18Z
source:         RIPE

% Information related to 'AS2856'

% Abuse contact for 'AS2856' is 'abuse@bt.com'

aut-num:        AS2856
as-name:        BT-UK-AS
descr:          BTnet UK Regional network
org:            ORG-BPIS1-RIPE
mp-import:      from AS5400 action pref=10; accept AS-BT-EU
mp-import:      from AS5400 action pref=14; accept ANY
mp-export:      to AS-ANY announce AS-BTGB
mp-import:      from AS702 action pref=11; accept AS702:RS-UK
mp-import:      from AS714 action pref=11; accept AS714
mp-import:      from AS786 action pref=11; accept AS-JANETPLUS
mp-import:      afi ipv4.unicast from AS1248 action pref=11; accept AS-HERE
mp-import:      afi ipv4.unicast from AS1267 action pref=11; accept AS-INFOSTRADA
mp-import:      from AS2119 action pref=11; accept AS-TELENOR
mp-import:      afi ipv4.unicast from AS2529 action pref=11; accept AS2529
mp-import:      from AS2818 action pref=11; accept AS-BBC
mp-import:      from AS2906 action pref=11; accept AS2906
mp-import:      from AS3223 action pref=11; accept AS3223
mp-import:      from AS3303 action pref=11; accept AS-SWCMGLOBAL
mp-import:      from AS4766 action pref=11; accept AS4766
mp-import:      afi ipv4.unicast from AS4788 action pref=11; accept AS4788
mp-import:      afi ipv4.unicast from AS5089 action pref=11; accept AS-NTLI
mp-import:      from AS5413 action pref=11; accept AS5413
mp-import:      from AS5459 action pref=11; accept AS-LINX
mp-import:      afi ipv4.unicast from AS5466 action pref=11; accept AS-EIRCOM
mp-import:      afi ipv4.unicast from AS5503 action pref=11; accept AS-RMIFL
mp-import:      afi ipv4.unicast from AS5588 action pref=11; accept AS-GTS-CE;
mp-import:      from AS5607 action pref=11; accept AS5607
mp-import:      afi ipv4.unicast from AS5631 action pref=11; accept AS-LUMINET
mp-import:      from AS6461 action pref=11; accept AS6461
mp-import:      from AS6667 action pref=11; accept AS-EUNETIP
mp-import:      afi ipv4.unicast from AS6677 action pref=11; accept AS-ICENET-RIX
mp-import:      afi ipv4.unicast from AS6730 action pref=11; accept AS-GLOBAL
mp-import:      afi ipv4.unicast from AS6774 action pref=11; accept AS6774:AS-BICS-TRANSIT
mp-import:      from AS6908 action pref=11; accept AS6908
mp-import:      afi ipv4.unicast from AS7342 action pref=11; accept AS7342
mp-import:      from AS8075 action pref=11; accept AS8075
mp-import:      from AS8220 action pref=11; accept AS8220
mp-import:      afi ipv4.unicast from AS8359 action pref=11; accept AS-MTU
mp-import:      afi ipv6.unicast from AS8359 action pref=11; accept AS-MTU-V6
mp-import:      from AS8426 action pref=11; accept AS-CLARANET
mp-import:      from AS8468 action pref=11; accept AS8468
mp-import:      from AS8551 action pref=11; accept AS-BEZEQINT
mp-import:      afi ipv4.unicast from AS8553 action pref=11; accept AS-AVENSYS
mp-import:      from AS8560 action pref=11; accept AS8560
mp-import:      afi ipv4.unicast from AS8607 action pref=11; accept AS-ATLAS
mp-import:      afi ipv4.unicast from AS8657 action pref=11; accept AS-CPRM
mp-import:      from AS8757 action pref=11; accept AS8757
mp-import:      from AS8781 action pref=11; accept AS-QTEL-SET
mp-import:      afi ipv4.unicast from AS8897 action pref=11; accept AS-KCOMSPN
mp-import:      from AS8902 action pref=11; accept AS8902
mp-import:      afi ipv4.unicast from AS8966 action pref=11; accept AS-EMIX
mp-import:      from AS9002 action pref=11; accept AS9002
mp-import:      from AS9009 action pref=11; acce
Routing

What AS2856 announces

Prefixes originated by AS2856 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).

IPv4 prefixes
541
IPv6 prefixes
7
IPv4 addresses
13,938,432 (54,447 /24s)
RPKI valid
393 71%
RPKI invalid
0
RPKI not found
155
ROAs naming AS2856
484
With an IRR route object
539 98%
Prefixes

Announced prefixes

Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.

IPv4 (541)
5.35.192.0/215.80.0.0/155.81.0.0/165.181.136.0/249.151.0.0/199.151.208.0/209.151.248.0/219.232.192.0/189.233.48.0/209.237.96.0/199.237.128.0/189.237.192.0/1915.145.20.0/2223.26.70.0/2423.26.108.0/2423.26.117.0/2423.26.131.0/2423.26.192.0/2423.27.32.0/2423.27.33.0/2423.27.34.0/2423.27.35.0/2423.27.36.0/2423.27.37.0/2423.27.38.0/2423.27.39.0/2423.27.40.0/2423.27.102.0/2423.27.103.0/2423.27.104.0/2423.27.105.0/2423.27.106.0/2423.27.107.0/2423.27.108.0/2423.230.82.0/2323.230.242.0/2423.230.252.0/2431.48.0.0/1331.90.0.0/1531.92.0.0/1531.94.0.0/1631.96.0.0/1631.100.0.0/1431.104.0.0/1631.106.0.0/1531.112.0.0/1431.116.0.0/1431.116.0.0/1631.117.0.0/1631.118.0.0/1631.119.0.0/1631.120.0.0/1631.121.0.0/1631.122.0.0/1531.124.0.0/1631.126.0.0/1531.130.240.0/2337.44.229.0/2437.44.230.0/2437.44.231.0/2437.97.112.0/2237.143.0.0/2237.230.61.0/2440.27.28.0/2440.27.72.0/2445.39.116.0/2445.39.188.0/2445.149.7.0/2445.149.168.0/2345.149.170.0/2346.68.0.0/1546.68.66.0/2446.248.96.0/2246.248.102.0/2346.248.104.0/2346.248.120.0/2250.117.7.0/2450.117.51.0/2450.118.154.0/2351.14.0.0/1651.64.32.0/2451.146.44.0/2251.146.128.0/2251.146.136.0/2251.146.235.0/2451.146.252.0/2251.149.18.0/2451.149.19.0/2451.194.36.0/2351.194.100.0/2251.230.0.0/2051.230.16.0/2051.230.32.0/2051.230.48.0/2051.230.64.0/2051.230.80.0/2051.230.96.0/2051.230.112.0/2051.230.255.0/2451.241.3.0/2451.241.201.0/2462.6.0.0/1662.7.0.0/1662.172.0.0/1662.192.124.0/2362.239.0.0/1662.244.11.0/2462.244.12.0/2462.244.29.0/2462.244.36.0/2462.244.37.0/2462.244.41.0/2462.244.43.0/2462.244.45.0/2462.244.56.0/2464.205.136.0/2264.205.144.0/2272.9.180.0/2277.90.135.0/2477.90.138.0/24
Show 421 more
77.90.145.0/2477.90.151.0/2477.90.153.0/2477.90.164.0/2477.90.184.0/2477.94.224.0/2478.105.97.0/2478.105.136.0/2278.105.151.0/2478.105.175.0/2478.105.179.0/2478.105.188.0/2478.105.191.0/2478.105.194.0/2478.105.198.0/2478.105.200.0/2478.105.202.0/2479.132.64.0/2479.132.65.0/2479.139.52.0/2379.139.54.0/2380.81.58.0/2481.128.0.0/1181.128.0.0/1281.161.52.0/2282.38.9.0/2482.38.56.0/2282.39.173.0/2482.41.112.0/2282.108.4.0/2282.108.32.0/2182.108.44.0/2282.108.52.0/2282.108.68.0/2282.108.88.0/2382.108.92.0/2282.108.102.0/2382.108.116.0/2282.108.140.0/2282.108.152.0/2382.136.54.0/2382.140.134.0/2482.140.138.0/2482.140.143.0/2482.140.170.0/2482.153.33.0/2482.153.85.0/2482.153.88.0/2482.153.179.0/2482.153.181.0/2482.153.190.0/2482.153.238.0/2483.223.153.0/2483.223.154.0/2483.245.16.0/2183.245.24.0/2284.23.0.0/1984.46.177.0/2484.46.181.0/2484.46.183.0/2484.46.188.0/2484.46.190.0/2484.46.191.0/2484.46.194.0/2484.55.17.0/2484.55.22.0/2485.88.224.0/2085.88.240.0/2385.189.72.0/2385.189.74.0/2385.189.76.0/2385.189.78.0/2385.189.132.0/2385.189.153.0/2485.189.154.0/2385.189.156.0/2485.189.159.0/2485.189.160.0/2485.189.162.0/2485.189.164.0/2385.189.167.0/2485.189.174.0/2385.189.178.0/2485.189.181.0/2485.189.183.0/2485.189.189.0/2485.189.190.0/2385.204.160.0/2285.235.123.0/2486.38.56.0/2486.38.63.0/2486.38.65.0/2486.38.67.0/2486.38.68.0/2486.38.86.0/2486.38.93.0/2486.38.118.0/2486.38.123.0/2486.38.148.0/2486.38.193.0/2486.38.233.0/2486.38.244.0/2486.54.81.0/2486.110.57.0/2486.128.0.0/1086.128.0.0/1186.128.0.0/1287.76.183.0/2487.81.112.0/2087.86.24.0/2387.86.248.0/2287.232.114.0/2487.237.16.0/2189.39.172.0/2389.117.183.0/2489.117.198.0/2489.117.203.0/2489.117.235.0/2489.145.172.0/2391.90.125.0/2491.90.127.0/2491.102.189.0/2491.102.190.0/2491.102.191.0/2491.111.0.0/1691.142.128.0/2491.227.78.0/2491.230.16.0/2491.230.40.0/2491.236.216.0/2394.26.64.0/2394.72.248.0/2194.125.16.0/2494.125.17.0/2494.125.18.0/2494.125.19.0/2494.194.188.0/2294.194.200.0/2294.194.204.0/2294.194.240.0/2294.232.100.0/2295.144.0.0/1395.173.59.0/24109.144.0.0/12109.180.0.0/15109.205.158.0/24109.249.0.0/16132.146.0.0/16132.153.3.0/24132.153.244.0/24132.153.245.0/24132.153.246.0/24132.153.247.0/24132.153.248.0/24132.153.249.0/24132.153.250.0/24132.153.251.0/24132.153.252.0/24132.153.253.0/24132.153.254.0/24132.244.79.0/24138.108.94.0/24142.205.162.0/23143.223.132.0/24144.87.0.0/20144.87.16.0/20144.87.24.0/21144.87.24.0/22144.87.28.0/22144.87.128.0/17144.177.74.0/23145.79.172.0/22147.78.68.0/22147.90.32.0/24147.90.36.0/24147.90.55.0/24147.90.115.0/24147.90.127.0/24147.148.0.0/14147.152.0.0/16147.189.68.0/22147.189.76.0/22148.252.3.0/24148.252.7.0/24148.253.220.0/23149.117.130.0/24149.254.0.0/16149.254.1.0/24151.240.180.0/22151.240.184.0/22151.240.188.0/22151.240.192.0/22151.240.196.0/22151.240.200.0/22151.241.52.0/22151.241.56.0/22151.241.60.0/22151.241.180.0/22151.241.184.0/22151.241.188.0/22151.241.192.0/22151.241.196.0/22151.241.200.0/22151.242.24.0/24151.242.42.0/24151.243.254.0/24151.244.80.0/22151.244.204.0/22151.244.208.0/22151.245.80.0/22151.245.204.0/22151.245.208.0/22151.246.145.0/24151.246.239.0/24151.247.220.0/24151.247.231.0/24151.247.245.0/24152.114.196.0/24152.114.220.0/23152.114.222.0/23156.146.3.0/24157.236.254.0/23157.236.254.0/24157.236.255.0/24159.180.96.0/19159.197.13.0/24159.197.44.0/24159.197.45.0/24159.253.66.0/23161.104.0.0/21163.5.37.0/24163.5.67.0/24163.5.98.0/24163.5.115.0/24163.5.122.0/24163.5.208.0/24163.5.217.0/24163.5.222.0/24163.5.249.0/24164.38.2.0/24164.38.12.0/24164.38.16.0/22164.38.31.0/24164.38.32.0/24164.38.33.0/24164.38.34.0/24164.38.120.0/22164.38.134.0/24164.38.148.0/24164.38.149.0/24164.38.156.0/24164.38.184.0/22164.38.196.0/24164.38.197.0/24164.134.1.0/24164.134.134.0/24164.134.135.0/24164.134.136.0/24164.134.137.0/24164.134.138.0/24165.120.0.0/16166.88.17.0/24166.88.18.0/24166.88.32.0/24166.88.200.0/24167.148.60.0/22178.78.106.0/23178.78.108.0/22178.78.112.0/21178.78.120.0/21178.92.112.0/22178.92.180.0/22178.93.104.0/22178.94.244.0/22178.95.60.0/22178.212.56.0/23185.58.165.0/24185.68.200.0/22185.90.32.0/22185.128.205.0/24185.149.6.0/24185.177.64.0/23185.230.13.0/24185.230.15.0/24188.172.160.0/21188.172.168.0/21188.220.122.0/24188.220.151.0/24188.220.157.0/24188.220.167.0/24188.220.194.0/24188.220.212.0/24188.220.229.0/24188.221.168.0/24188.221.177.0/24188.221.184.0/24188.221.188.0/24188.221.210.0/24192.8.112.0/24192.8.149.0/24192.12.73.0/24192.53.46.0/24192.65.219.0/24192.65.221.0/24192.65.222.0/24192.65.223.0/24192.65.224.0/24192.65.225.0/24192.65.226.0/24192.65.227.0/24192.65.228.0/24192.152.14.0/24192.177.94.0/23193.9.26.0/24193.23.32.0/24193.32.46.0/24193.32.48.0/24193.33.199.0/24193.35.128.0/20193.35.158.0/23193.35.160.0/23193.35.197.0/24193.35.220.0/22193.36.78.0/23193.36.80.0/22193.36.80.0/24193.36.240.0/24193.36.243.0/24193.36.253.0/24193.37.142.0/24193.37.160.0/20193.38.192.0/19193.38.192.0/22193.38.192.0/23193.38.194.0/23193.39.141.0/24193.84.142.0/24193.111.18.0/24193.111.19.0/24193.113.0.0/16193.138.107.0/24193.187.140.0/22193.195.138.0/24194.32.20.0/22194.32.29.0/24194.32.31.0/24194.32.207.0/24194.35.183.0/24194.36.68.0/24194.36.135.0/24194.59.188.0/24194.60.136.0/24194.60.137.0/24194.60.138.0/24194.60.139.0/24194.72.0.0/14194.101.69.0/24194.102.0.0/19194.132.24.0/24194.132.25.0/24194.155.58.0/24194.169.32.0/21194.189.44.0/24194.189.186.0/23194.227.72.0/24194.227.73.0/24194.227.120.0/24194.246.78.0/24195.35.123.0/24195.36.106.0/24195.88.20.0/24195.99.0.0/16195.104.240.0/24195.130.3.0/24195.130.6.0/24195.130.11.0/24195.130.12.0/24195.130.13.0/24195.130.14.0/24195.130.15.0/24195.171.0.0/16195.182.62.0/24195.218.32.0/19198.178.235.0/24198.232.43.0/24205.239.40.0/23205.239.42.0/24207.180.43.0/24209.101.8.0/23212.82.0.0/19212.134.46.0/24212.134.52.0/24212.134.54.0/24212.134.124.0/22212.134.164.0/22212.134.208.0/22212.134.224.0/22212.140.0.0/16212.148.1.0/24212.212.16.0/22213.1.0.0/16213.120.0.0/14213.169.196.0/23213.169.202.0/23213.190.16.0/23213.190.18.0/23213.205.192.0/18213.205.208.0/20213.209.146.0/24213.209.149.0/24213.209.150.0/24213.249.188.0/22216.120.189.0/24216.165.88.0/24217.15.64.0/20217.31.9.0/24217.31.10.0/23217.32.0.0/12217.217.36.0/22217.217.56.0/22217.217.60.0/22
IPv6 (7)
2001:4878:c259::/482a00:2380::/252a01:4c8::/292a01:4c8:f400::/482a01:4c8:f401::/482a02:ee80:4176::/472a03:1e82:90ff::/48

RPKI valid   RPKI invalid   no ROA covers it

Neighbors

Who AS2856 is reached through

The AS just before AS2856 in the paths our looking glass collectors hold, for 60 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.

AS5400 BT 60
ASPA

Provider authorization

AS2856 publishes no ASPA of its own. 6 ASes name it as a provider in theirs. Check a path.

The 6 ASes that name AS2856 as a provider
AS9011 TheAS13447 QYRUS-INCAS15248 METASWITCH-AS1AS197545 Era4-ASNAS200167 excellondonAS202907 ATOMICIT
IRR

Routing registry objects

From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.

Sourceas-nameMaintained by
RIPEBT-UK-ASRIPE-NCC-END-MNT, BTNET-INFRA-MNT

Route objects with origin AS2856: RIPE 603 · RADB 191 · ARIN 49 · NTTCOM 3 · LEVEL3 2

as-sets that list AS2856 (20)
AS-ATRATO:AS-PEERSAS-BSVE:AS-LINX-PEERS-1AS-BSVE:AS-LINX-PEERS-2AS-BT-UKAS-BTGBAS-LEVEL3-ORIGINS-EUAS-LUMEN-CUSTOMERS-ASNSAS-PLUSNETUK:AS-LINX-PEERS-PRIAS-PLUSNETUK:AS-LINX-PEERS-SECAS-RIS-RRC01AS-TMNET-PEERSAS-TRANSROUTE-SPECAS-UDOSAS-UUNETPIPEXLINXAS13030:AS-PEERSAS199746:AS-BLACKLISTAS204464:AS-BLACKLISTAS270118:AS-GSLAS2856:AS-UKPLAS3303:AS-SWCMPEERS
Tools

Check AS2856 live

ASN lookup and WHOISRPKI validatorASPA validatorIRR lookup