Autonomous system
AS25577 C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED
Hosting APNIC NSP
Summary
Mainframe & Cybernetic Systems
hosting business uk
The AS handle C4L-AS is held by Mainframe & Cybernetic Systems Limited.
What it's used for
- The address space carries hosting and business services, evidenced by netnames such as
UK-FRAME-20040922andUK-FRAME-20120705associated with the registrant. - The network announces 48640 IPv4 addresses across 60 prefixes and 1 IPv6 prefix, while maintaining 101 observed neighbours, a ratio that suggests a transit or service provider role rather than a simple access network.
Notable
- All sampled registrants for the largest prefixes are listed as
MAINFRAME & CYBERNETIC SYSTEMS LIMITED, which aligns with the AS holder. - The address inventory is heavily concentrated in the
84.45.0.0/16range, with multiple /19, /20, and /21 blocks, alongside smaller /22 and /23 allocations from other ranges like5.133.0.0/16and81.27.0.0/16.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| LINX LON1 | London, United Kingdom | 195.66.224.201 |
| London Network Access Point | London, United Kingdom | 5.57.80.217 |
Transit providers
23 upstream, 10 downstream and 43 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-02, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 60 prefixes · 48.64K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 61 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS25577- Registry name
- C4L-AS
- Registrant
- lir-uk-frame-1-MNT
- Abuse contact
- frank@bec.uk
- Registered
- 2003-01-15
- Last changed
- 2026-03-03
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- MAINFRAME & CYBERNETIC SYSTEMS LIMITED
- Network type
- NSP
- Scope
- Europe
- Traffic ratio
- Balanced
- Peering policy
- Selective
- IRR as-set
AS-C4L- Present at
- 3 exchanges
- Facilities
- 25 facilities
- Website
- http://bec.uk
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 20% valid · 11 valid, 42 with no ROA 1 RPKI-invalid
- ROAs
- 12 authorising AS25577
- ASPA
- no ASPA record
- IRR
- 91% registered · 49 of 54 announcements 2 other origin
- Route objects
- 65 naming AS25577
Reputation
Classification and threat
Hosting Datacenter or cloud provider. Addresses are servers, not people.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 448 networks and 1,851 prefixes, as published 2026-11-03. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere