$ query “AS25577” --type=asn → 1 result(s)

AS25577 · C4L-AS

MAINFRAME & CYBERNETIC SYSTEMS LIMITED

AS25577 is run by MAINFRAME & CYBERNETIC SYSTEMS LIMITED and is a mid-size transit provider, based in the United Kingdom since 2003. The system announces a respectable 50 944 IPv4 addresses, and supports IPv6. The bulk of its IP address space is in the United Kingdom, with additional presence in Türkiye and Australia, and smaller footprints in 3 additional countries. This AS's prefix announcements have been recently modified.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇬🇧 United Kingdom
Category
Hosting
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
January 15, 2003
Last Changed
March 04, 2026
Last Seen
July 27, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
53 / 44
IPv6 Prefixes (raw / aggregated)
1 / 1
IPv4 Addresses
50 944
Largest IPv4 Prefix
/18 (16 384 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇬🇧 United Kingdom (57 792 IPs), 🇹🇷 Türkiye (2 256 IPs), 🇦🇺 Australia (528 IPs) and 3 more
Prefix Changed
July 23, 2026

Reputation

Reputation
Pristine — 0 flagged IPs
Open Proxies
1 known open proxies in this network

Connectivity Summary

Upstream Providers
3 upstreams providing transit
Peers
100 networks exchanging traffic without transit
Downstream Customers
10 downstreams buying transit
Unclassified
2 unclassified BGP neighbors
Degree
115 unique BGP neighbors
Reach
18 networks in customer cone

Upstream Providers (3)

  • AS174 — COGENT (Tier-1 transit)
  • AS3257 — GTT-BACKBONE (Tier-1 transit)
  • AS3223 — VOXILITY

Prefix Lists

IPv4 Prefixes (53 total)

  • 84.45.64.0/18 (16 384 addresses (/18 prefix))
  • 84.45.32.0/19 (8 192 addresses (/19 prefix))
  • 84.45.16.0/20 (4 096 addresses (/20 prefix))
  • 109.104.120.0/21 (2 048 addresses (/21 prefix))
  • 84.45.8.0/21 (2 048 addresses (/21 prefix))
  • 81.27.88.0/21 (2 048 addresses (/21 prefix))
  • 5.133.184.0/22 (1 024 addresses (/22 prefix))
  • 81.27.80.0/22 (1 024 addresses (/22 prefix))
  • 185.5.88.0/22 (1 024 addresses (/22 prefix))
  • 109.104.116.0/22 (1 024 addresses (/22 prefix))
  • 37.58.24.0/22 (1 024 addresses (/22 prefix))
  • 109.68.64.0/23 (512 addresses (/23 prefix))
  • 78.40.56.0/23 (512 addresses (/23 prefix))
  • 85.159.90.0/23 (512 addresses (/23 prefix))
  • 109.104.96.0/23 (512 addresses (/23 prefix))
  • 81.27.66.0/23 (512 addresses (/23 prefix))
  • 81.27.72.0/23 (512 addresses (/23 prefix))
  • 109.104.100.0/23 (512 addresses (/23 prefix))
  • 31.3.212.0/23 (512 addresses (/23 prefix))
  • 185.229.20.0/23 (512 addresses (/23 prefix))
  • 5.133.188.0/23 (512 addresses (/23 prefix))
  • 82.197.72.0/24 (256 addresses (/24 prefix))
  • 37.58.29.0/24 (256 addresses (/24 prefix))
  • 81.27.76.0/24 (256 addresses (/24 prefix))
  • 81.27.75.0/24 (256 addresses (/24 prefix))
  • 81.27.64.0/24 (256 addresses (/24 prefix))
  • 78.40.61.0/24 (256 addresses (/24 prefix))
  • 85.159.88.0/24 (256 addresses (/24 prefix))
  • 77.73.15.0/24 (256 addresses (/24 prefix))
  • 85.159.95.0/24 (256 addresses (/24 prefix))
  • 77.73.11.0/24 (256 addresses (/24 prefix))
  • 109.68.68.0/24 (256 addresses (/24 prefix))
  • 81.27.87.0/24 (256 addresses (/24 prefix))
  • 109.104.98.0/24 (256 addresses (/24 prefix))
  • 31.3.223.0/24 (256 addresses (/24 prefix))
  • 109.104.105.0/24 (256 addresses (/24 prefix))
  • 109.104.112.0/24 (256 addresses (/24 prefix))
  • 109.104.114.0/24 (256 addresses (/24 prefix))
  • 31.3.221.0/24 (256 addresses (/24 prefix))
  • 31.3.211.0/24 (256 addresses (/24 prefix))
  • 178.251.233.0/24 (256 addresses (/24 prefix))
  • 178.251.239.0/24 (256 addresses (/24 prefix))
  • 31.3.208.0/24 (256 addresses (/24 prefix))
  • 5.133.191.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (1 total)

  • 2001:9d8::/32