ASN Lookup Tool

Cambridge Fibre Networks Ltd. cfn.ltd GB GB 2 Routes

AS Data

AS205311

AS205311Cambridge Fibre Networks Ltd.

AS Number 205311
AS Name Cambridge_Fibre_Networks
Organization Cambridge Fibre Networks Ltd.(org-cfnl1-ripe)
Country GB
Website cfn.ltd
Number of IPv4 Routes 1
Number of IPv6 Routes 1
ASN type ISP
Allocation Status ASSIGNED
Registry RIPE
Date Allocated 2017-09-25

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Use ASN data for AS205311 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
185.219.108.0/22 1024
2a0b:e540::/29 ~634×10²⁷

Raw Whois Response

% 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 'AS203940 - AS205662'

as-block:       AS203940 - AS205662
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:        2026-03-05T15:29:31Z
last-modified:  2026-03-05T15:29:31Z
source:         RIPE

% Information related to 'AS205311'

% Abuse contact for 'AS205311' is 'abuse@cfn.ltd'

aut-num:        AS205311
as-name:        Cambridge_Fibre_Networks
org:            ORG-CFNL1-RIPE
import:         from AS35826 accept ANY
export:         to AS35826 announce AS205311
import:         from AS8330 accept AS-LONAP
export:         to AS8330 announce AS205311
admin-c:        CFN7-RIPE
tech-c:         CFN7-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         uk-cfn-1-mnt
created:        2017-09-25T14:45:30Z
last-modified:  2019-07-03T13:55:30Z
source:         RIPE

organisation:   ORG-CFNL1-RIPE
org-name:       Cambridge Fibre Networks Ltd.
country:        GB
org-type:       LIR
address:        21 Signet Court
address:        CB5 8LA
address:        Cambridge
address:        UNITED KINGDOM
phone:          +44 1223 800085
admin-c:        JM19237-RIPE
tech-c:         JM19237-RIPE
abuse-c:        AR42860-RIPE
mnt-ref:        uk-cfn-1-mnt
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         uk-cfn-1-mnt
created:        2017-08-31T09:09:55Z
last-modified:  2020-12-16T13:30:53Z
source:         RIPE # Filtered

role:           CFN - Network Operations
address:        21 Signet Court
address:        Cambridge
address:        CB5 8LA
address:        United Kingdom
nic-hdl:        CFN7-RIPE
admin-c:        BRSM2-RIPE
admin-c:        JM19237-RIPE
tech-c:         BRSM2-RIPE
tech-c:         JM19237-RIPE
abuse-mailbox:  abuse@cfn.ltd
mnt-by:         uk-cfn-1-mnt
created:        2017-09-22T15:49:09Z
last-modified:  2017-09-22T15:49:09Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.121.2 (DEXTER)

Parsed Whois Response

Peers

AS Number Description Country
AS35826 Netservers Limited GB
AS8330 LONAP Ltd GB

Upstreams

AS Number Description Country
AS35826 Netservers Limited GB

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Frequently Asked Questions

ASN AS205311 is an Autonomous System Number used to identify a network for BGP internet routing.
AS205311 is listed under Cambridge Fibre Networks Ltd..
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.