ASN Lookup Tool

Cityfibre Limited cityfibre.com GB GB 1 Routes

AS Data

AS204018

AS204018Cityfibre Limited

AS Number 204018
AS Name Cityfibre
Organization Cityfibre Limited(org-chl10-ripe)
Country GB
Website cityfibre.com
Number of IPv4 Routes 1
Number of IPv6 Routes 0
ASN type ISP
Allocation Status ASSIGNED
Registry RIPE
Date Allocated 2015-09-14

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Use ASN data for AS204018 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
156.67.240.0/24 256

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 'AS204018'

% Abuse contact for 'AS204018' is 'abuse@cityfibre.com'

aut-num:        AS204018
as-name:        Cityfibre
org:            ORG-CHL10-RIPE
import:         from AS3356 accept ANY
export:         to AS3356 announce AS204018
import:         from AS174 accept ANY
export:         to AS174 announce AS204018
import:         from AS24931 accept ANY
export:         to AS24931 announce AS204018
import:         from AS19693 accept ANY
export:         to AS19693 announce AS204018
admin-c:        DT7249-RIPE
tech-c:         CFH10-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MNT-CITYFIBRE
created:        2015-09-14T13:56:04Z
last-modified:  2018-09-04T11:39:47Z
source:         RIPE

organisation:   ORG-CHL10-RIPE
org-name:       Cityfibre Limited
country:        GB
org-type:       LIR
address:        15 Bedford Street
address:        WC2E 9HE
address:        London
address:        UNITED KINGDOM
phone:          +448452930774
admin-c:        NAS84-RIPE
admin-c:        CP9568-RIPE
admin-c:        DT7249-RIPE
admin-c:        BC5792-RIPE
tech-c:         CFH10-RIPE
abuse-c:        CFH11-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        MNT-CITYFIBRE
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-CITYFIBRE
created:        2014-12-10T09:18:33Z
last-modified:  2020-12-16T13:30:26Z
source:         RIPE # Filtered

role:           CityFibre Netops
address:        CityFibre Holdings Ltd 15 Bedford Street London WC2E 9HE UNITED KINGDOM
phone:          +448452930774
nic-hdl:        CFH10-RIPE
abuse-mailbox:  abuse@cityfibre.com
mnt-by:         MNT-CITYFIBRE
created:        2014-12-17T10:23:23Z
last-modified:  2014-12-17T10:23:23Z
source:         RIPE # Filtered

person:         David Tomalin
address:        CityFibre Holdings Ltd 15 Bedford Street London WC2E 9HE UNITED KINGDOM
phone:          +44 788 0506011
nic-hdl:        DT7249-RIPE
mnt-by:         MNT-CITYFIBRE
created:        2015-05-26T06:09:00Z
last-modified:  2015-05-26T06:09:00Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.121.1 (DEXTER)

Parsed Whois Response

Peers

AS Number Description Country
AS3549 Level 3 Communications, Inc. (GBLX) US
AS19693 Centrilogic, Inc. US
AS24931 RIPE Network Coordination Centre NL
AS3356 Level 3 Parent, LLC US
AS174 Cogent Communications, LLC US

Upstreams

AS Number Description Country
AS3356 Level 3 Parent, LLC US

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Frequently Asked Questions

ASN AS204018 is an Autonomous System Number used to identify a network for BGP internet routing.
AS204018 is listed under Cityfibre Limited.
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.