AS25577 MAINFRAME & CYBERNETIC SYSTEMS LIMITED

United Kingdom C4L-AS RIPE 53 IPv4 prefixes 1 IPv6 prefix

IPv4 addresses

50,688

IPv6 /48 networks

65,536

RPKI

11 valid1 invalid42 no ROA

Peers and downstreams

Holder

AS name: C4L-AS
Description: MAINFRAME & CYBERNETIC SYSTEMS LIMITED
Organisation: MAINFRAME & CYBERNETIC SYSTEMS LIMITED
Registered in: London, United Kingdom
Abuse contact: frank@bec.uk
Assigned: 2003-01-14
Registered: 2003-01-15
Record last changed: 2026-03-03 11:00 UTC

AS286	Kpn KPN
AS917	Misaka Network, Inc. MISAKA
AS1031	PEER 1031 LLC PEER1-1031
AS1267	WIND TRE S.P.A. ASN-WINDTRE
AS1828	Unitas Global UNITAS
AS2856	British Telecommunications Limited BT-UK-AS
AS3170	VeloxServ Communications Ltd VELOXSERV
AS3214	xTom GmbH XTOM
AS3303	Swisscom (Schweiz) AG SWISSCOM
AS3741	Dimension Data
AS4455	IX Reach Ltd BSO
AS4637	Telstra Global ASN-TELSTRA-GLOBAL
AS5405	Inter.link GmbH INTERDOTLINK
AS6057	Administracion Nacional de Telecomunicaciones AS6057
AS6204	TMRC GROUP SRL ZET-NET
AS6424	EDGOO NETWORKS UNIPESSOAL LDA EDGOO
AS6667	Elisa Oyj EUNET-FINLAND
AS6894	KDDI Europe Ltd KDDI-EUROPE
AS7195	EDGEUNO S.A.S AS7195
AS8218	Zayo Infrastructure France SA NEO-ASN
AS8426	Claranet Limited CLARANET-AS
AS8455	atom86 BV ATOM86-AS
AS8943	Jump Networks Ltd JUMP
AS9009	M247 Europe SRL M247
AS9044	BSE Software GmbH SOLNET
AS9505	Taiwan Internet Gateway TWGATE-AP
AS12552	GlobalConnect AB GlobalConnect-AS12552
AS12779	IT.Gate S.p.A. ITGATE
AS12969	Ljosleidarinn ehf Vodafone_Iceland
AS13237	euNetworks GmbH LAMBDANET-AS
AS14630	Invesco Group Services, Inc. INVESCO
AS14840	BR.Digital Telecom AS14840
AS15412	Flag Telecom UK Limited FLAG-AS
AS15802	Emirates Integrated Telecommunications Company PJSC DU-AS1
AS16347	ADISTA SAS INHERENT
AS17639	Converge ICT Solutions Inc. CONVERGE-AS
AS18106	Viewqwest Pte Ltd VIEWQWEST-SG-AP
AS20562	Broadband Hosting B.V. OPEN-PEERING-AS
AS21215	UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd UGNI
AS22356	Durand do Brasil Ltda AS22356
AS24482	SG.GS SGGS-AS-AP
AS25160	Vorboss Limited VORBOSS
AS28792	Public Internet Ltd PUBLIC-INTERNET
AS29075	IELO-LIAZO SERVICES SAS IELO
AS29169	GANDI SAS GANDI-AS
AS30844	Liquid Telecommunications Ltd LIQUID-AS
AS31122	Digiweb ltd DIGIWEB-AS
AS31500	Global Network Management Inc GNM-AS
AS31742	Sota Solutions Ltd. SOTACONNECT
AS33891	Core-Backbone GmbH CORE-BACKBONE
AS34177	Celeste SAS CELESTE-AS
AS34288	Kantonsschule Zug AS34288
AS34927	iFog GmbH iFog-GmbH
AS35266	EX Networks Limited EXN-AS
AS36236	NetActuate, Inc NETACTUATE
AS37100	SEACOM Limited
AS37468	Angola Cables
AS37497	Network Platforms (PTY) LTD
AS37680	Cool Ideas Service Provider (Pty) Ltd
AS37721	Virtual Technologies & Solutions
AS39122	Blacknight Internet Solutions Limited BLACKNIGHT-AS
AS39351	31173 Services AB ESAB-AS
AS41327	Fiber Telecom S.p.A. FIBERTELECOM-AS
AS42473	Anexia Cloud Solutions GmbH AS-ANEXIA
AS48070	DSM (GB) Limited DSM
AS48185	team.blue NV team_blue
AS48362	Tkswf TKSWF-AS
AS49544	i3D.net B.V i3Dnet
AS50300	CustodianDC Limited CUSTDC
AS50304	Blix Solutions AS BLIX
AS51185	MainStreaming SpA MAINSTREAMING-AS
AS60171	AFR-IX TELECOM S.A. AFRIX-AS
AS61049	Exascale Ltd EXASCALE
AS61573	IP TELECOM AS61573
AS62167	Tismi BV Tismi
AS137409	GSL Networks Pty LTD GSLNETWORKS-AS-AP
AS198150	SIACOM JSC SIACOM-AS
AS207841	Inferno Communications Ltd INFERNO
AS212483	LEVEL EIGHTY-SIX COMMUNICATIONS LTD level86
AS215638	Cilix Limited AS-CILIX-LIMITED
AS263152	MIGO TELECOM AS263152
AS264409	Huge Solucoes Corporativas Ltda AS264409
AS271253	LINK BRASIL TELECOMUNICACOES LTDA AS271253

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade C · 60/100

partly	Prefixes covered by valid ROAs 11 of 54 announced prefixes are RPKI valid, 42 have no ROA.	5/25
fail	No RPKI invalid announcements 1 announced prefix is RPKI invalid and dropped by networks that validate.	0/10
pass	Announces IPv6 1 IPv6 prefix.	15/15
pass	More than one upstream 9 upstreams seen in BGP.	10/10
pass	Working abuse contact frank@bec.uk is published.	15/15
fail	Publishes a geofeed No geofeed found. Without one, location databases have to guess.	0/10
pass	No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger.	10/10
pass	Registry record maintained Last changed 2026-03-03.	5/5

Built from the announced prefixes, RPKI, the registry record and geofeeds. Checks without data are not counted. Also in the API.

Show this on your website

HTML

<a href="https://ip-fd.net/asn/25577"><img src="https://ip-fd.net/badge/asn/25577/health.svg" alt="AS25577 network health on IP-FD.net"></a>

Markdown

[![AS25577 network health](https://ip-fd.net/badge/asn/25577/health.svg)](https://ip-fd.net/asn/25577)

Use rpki.svg instead of health.svg for the RPKI badge.

Routing changes

Last 30 days

2026-10-04 13:08 UTC	Neighbour gone	AS207162	downstream
2026-10-04 13:08 UTC	Neighbour gone	AS37282	upstream
2026-10-04 13:08 UTC	Neighbour gone	AS7575	upstream
2026-10-04 13:08 UTC	Relationship changed	AS9505	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS9044	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS9009	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS8943	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS8455	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS8218	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS7195	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS6204	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS61049	upstream to peer
2026-10-04 13:08 UTC	New neighbour	AS6057	peer
2026-10-04 13:08 UTC	Relationship changed	AS60171	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS5405	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS50304	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS48362	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS4637	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS4455	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS41327	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS39351	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS37497	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS37468	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS3741	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS37100	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS34927	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS34177	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS33891	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS3303	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS3214	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS31500	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS30844	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS29169	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS29075	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS286	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS2856	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS264409	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS24482	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS22356	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS215638	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS21215	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS20562	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS15802	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS15412	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS14840	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS137409	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS12779	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS1267	upstream to peer
2026-10-04 13:08 UTC	Relationship changed	AS12552	upstream to peer
2026-10-04 13:08 UTC	New neighbour	AS1031	peer

WHOIS

aut-num:        AS25577
as-name:        C4L-AS
org:            ORG-MCSL9-RIPE
remarks:        ***
remarks:        Transit Customers
remarks:        ***
remarks:        Hosting Systems UK Private Peering
remarks:        UK Dedicated Transit
remarks:        Thinkgrid
remarks:        Transversal
remarks:        Noomobile
remarks:        EurISP
remarks:        Orbis Telecom
remarks:        Contactual
remarks:        DigiMedia
remarks:        Upstream Internet
remarks:        Selection Services Ltd
remarks:        Thermeon BGP
remarks:        One Connect
remarks:        Interfax Communications
remarks:        WebAge Limited
remarks:        Accesspoint Technologies
remarks:        **********************************
remarks:        *** Transit Suppliers ***
remarks:        **********************************
remarks:        NTT
remarks:        TINET
remarks:        Seabone
remarks:        **********************************
remarks:        *** LINX/LONAP & Private Peers ***
remarks:        **********************************
remarks:        **********************************
remarks:        *** Full Transit Customers ***
remarks:        **********************************
admin-c:        AA46272-RIPE
tech-c:         AA46272-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         lir-uk-frame-1-MNT
created:        2003-01-15T11:46:06Z
last-modified:  2026-03-03T11:00:16Z
source:         RIPE
% 200 routing policy lines (import/export) not shown

Routing data

Updated just now

Registry record

Fetched just now from RIPE

Prefixes and neighbours come from the RIPE RIS route collectors. Data older than 5 minutes is refreshed when this page is opened.

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/asn/25577

const res = await fetch('https://ip-fd.net/api/v1/asn/25577', {
  headers: { 'X-API-Key': 'YOUR_KEY' }
});
const data = await res.json();
console.log(data);

import requests

r = requests.get('https://ip-fd.net/api/v1/asn/25577', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/25577');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-API-Key: YOUR_KEY']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = json_decode(curl_exec($ch), true);
print_r($data);

req, _ := http.NewRequest("GET", "https://ip-fd.net/api/v1/asn/25577", nil)
req.Header.Set("X-API-Key", "YOUR_KEY")
res, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Works without a key at a lower rate. Get a free key.

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