Home Prefix Lookup161.104.0.0/21

161.104.0.0/21 - BT UK British Telecommunications Limited (AS2856)

IPv4RIPE NCCassignedAS2856BT-UK-AS British Telecommunications Limited RPKI Valid

CIDR

161.104.0.0/21

IP Version

IPv4

Addresses

Mask

/21 (255.255.248.0)

Country

🇬🇧 United Kingdom

City

London (Colindale)

RIR

RIPE NCC

Status

assigned

Allocated

1992-06-24

Announced BGP Routes

1 of 1 route

RPKI:

IRR:

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Prefix	Origin AS	RPKI	IRR	Last Seen
161.104.0.0/21	AS2856 BT-UK-AS British Telecommunications Limited	Valid	RIPE	2026-10-12

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
161.104.0.0/21	AS2856	/21	ripe

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS2856	RIPE	us-fxcapital-1-mnt	2026-06-18

Origin ASN

AS2856

BT-UK-AS British Telecommunications Limited

Related Prefixes

More prefixes of AS2856

All prefixes of AS2856 →

Geolocation

Country🇬🇧United KingdomGB

RegionEngland

CityLondon (Colindale)

Coordinates51.5897, -0.2491 ↗

Abuse Contact

Learn more

RPKI and ROAs explainedWhat RPKI valid, invalid and no ROA mean
RPKI validatorCheck ROA coverage for any prefix or ASN
What is BGP?How prefixes are announced and routed
More-specific prefixesGlossary: covering and more-specific routes
IPv4 transfers in the RIPE NCC regionWho bought and sold address space recently

API

Open

GEThttps://api.ipctl.io/v1/prefix/161.104.0.0/21

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/161.104.0.0/21" | jq

External Links

RIPEstat