HomeASN LookupAS25577

AS25577 C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED

🇬🇧

Org handle: ORG-MCSL9-RIPE

RIPE NCCallocated
Announced Prefixes (BGP)
57total
56 IPv41 IPv6
IPv4 Addresses
Allocated (RIR)49,664
Announced (BGP)56,064
IPv6 Addresses
Allocated (RIR)0
Announced (BGP)7.9×10²⁸
Prefix Limit (IPv4)
200
Prefix Limit (IPv6)
5
Country
🇬🇧 GB
RIR
RIPE NCC
Status
allocated
Allocated
2003-01-15

Routing hygiene

Score 54/100 · High risk
RPKI ROA coverage
21.1%
3 prefixes RPKI invalid
IRR route objects
86%
4 prefixes registered for another origin
Hijack signals
2
2 announced against others' ROAs, 0 own announced by others
Upstreams
7
diversity 71/100
  • 79% of announced prefixes (45 of 57) have no valid ROA, 3 of them RPKI invalid
  • Announces 2 prefixes that RPKI assigns to another network (possible hijack or misconfiguration)
  • 2 prefixes registered in IRR route objects for another active network and not authorized by a ROA
  • 14% of announced prefixes (8 of 57) have no IRR route object for this ASN

Based on 57 announced prefixes, updated daily (2026-10-25). How the score works · RPKI explained

Announced Prefixes

(BGP)57
|
Prefix
RPKI
IRR
Last Seen
5.133.184.0/22
 Valid
RIPE
2026-10-26
5.133.188.0/23
No ROA
RIPE
2026-10-26
5.133.191.0/24
No ROA
RIPE
2026-10-26
31.3.208.0/24
 Valid
RIPE
2026-10-26
31.3.211.0/24
No ROA
RIPE
2026-10-26
31.3.212.0/23
No ROA
RIPE
2026-10-26
31.3.221.0/24
No ROA
RIPE
2026-10-26
31.3.223.0/24
No ROA
RIPE
2026-10-26
37.58.24.0/22
No ROA
RIPE
2026-10-26
37.58.29.0/24
No ROA
RIPE
2026-10-26
1-10 of 57
1 / 6

Allocated Prefixes

(RIR)46
Prefix
Country
RIR
Status
5.133.184.0/22🇬🇧 GBRIPENCCallocated
5.133.188.0/23🇬🇧 GBRIPENCCallocated
5.133.191.0/24🇬🇧 GBRIPENCCallocated
31.3.208.0/24🇬🇧 GBRIPENCCallocated
31.3.211.0/24🇬🇧 GBRIPENCCallocated
31.3.212.0/23🇬🇧 GBRIPENCCallocated
31.3.221.0/24🇬🇧 GBRIPENCCallocated
31.3.223.0/24🇬🇧 GBRIPENCCallocated
37.58.24.0/22🇬🇧 GBRIPENCCallocated
37.58.29.0/24🇬🇧 GBRIPENCCallocated
1-10 of 46
1 / 5

All 57 announced prefixes of AS25577 →

Downstream Customers(2)

ASNName
AS44934🇬🇧ARACHSYS Arachsys Internet Services Ltd
AS206626🇬🇧PSDGroup-AS Professional Software Design Ltd

BGP Neighbours

(seen in AS paths)

Upstreams (7)

Networks AS25577 hands its own prefixes to: transit providers, or peers at an exchange.

  • AS174Cogent Communications26
  • AS3257GTT BACKBONE GTT Communications17
  • AS33891CORE BACKBONE Core Backbone6
  • AS6204ZET NET INTERKVM HOST4
  • AS3223VOXILITY LLP2
  • AS8966Etisalat EMIRATES TELECOMMUNICATIONS GROUP COMPANY (ETISALAT GROUP) PJSC1
  • AS49544I3Dnet I3D.Net B.V1

Downstreams (8)

Networks whose own prefixes AS25577 passes on: usually its customers.

  • AS31708COREIX UK Coreix25
  • AS44934ARACHSYS Internet Services3
  • AS59493MIMIC Cudo Ventures2
  • AS203035Xc360 Xara Computers (UK)2
  • AS218531Wsd Uk WallStreetDocs2
  • AS49503IDE GROUP MANAGE MAINFRAME & CYBERNETIC SYSTEMS LIMITED1
  • AS50882MAXNETT1
  • AS51572CERULEAN Solutions Limited1

Other adjacent networks (4)

Adjacent to AS25577 in the transit part of AS paths: peers, providers or customers.

  • AS6939Hurricane Electric2
  • AS12552GlobalConnect AS12552 GlobalConnect AB2
  • AS205434Elasticity BE SLOUGH DC UK LIMITED2
  • AS34177CELESTE SAS1

Transfer History

Registry transfers of AS25577 between organisations.

1
ASPA
No ASPA0 upstreams, 2 downstreams
Listed as Upstream Provider by
2 ASNs
View full ASPA details →
Abuse Contact
External Links
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Learn more

API
Open
GEThttps://api.ipctl.io/v1/asn/25577

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/25577" | jq