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AS25577 C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED

C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED · registered in the United Kingdom

IPv4 addresses48,64060 prefixes · 0.002% of announced IPv4
Rank in United Kingdom#93largest network in GB by IPv4 space, of 2,074 · 0.07% of GB
Rank worldwide#3,992of 79,396 networks with IPv4
IPv61 x /32 (65,536 x /48)1 prefixes
CountryUnited Kingdom2,261 ASNs registered there
Open AS25577 in ASN lookup Look up an IP in this network (5.133.184.1) All networks in United Kingdom

IPv4 prefixes

All 60 prefixes, in address order.

  • 5.133.184.0/22
  • 5.133.188.0/23
  • 5.133.191.0/24
  • 31.3.208.0/24
  • 31.3.211.0/24
  • 31.3.212.0/23
  • 31.3.221.0/24
  • 31.3.223.0/24
  • 37.58.24.0/22
  • 37.58.29.0/24
  • 77.73.11.0/24
  • 77.73.15.0/24
  • 78.40.56.0/23
  • 78.40.61.0/24
  • 81.27.64.0/24
  • 81.27.66.0/23
  • 81.27.72.0/23
  • 81.27.75.0/24
  • 81.27.76.0/24
  • 81.27.80.0/23
  • 81.27.82.0/23
  • 81.27.87.0/24
  • 81.27.88.0/22
  • 81.27.92.0/24
  • 81.27.93.0/24
  • 81.27.94.0/23
  • 82.197.72.0/24
  • 84.45.8.0/22
  • 84.45.12.0/23
  • 84.45.14.0/24
  • 84.45.16.0/21
  • 84.45.24.0/22
  • 84.45.28.0/23
  • 84.45.32.0/20
  • 84.45.48.0/23
  • 84.45.51.0/24
  • 84.45.52.0/22
  • 84.45.56.0/21
  • 84.45.64.0/21
  • 84.45.72.0/22
  • 84.45.76.0/22
  • 84.45.80.0/20
  • 84.45.96.0/19
  • 85.159.88.0/24
  • 85.159.90.0/23
  • 85.159.95.0/24
  • 109.68.64.0/23
  • 109.68.68.0/24
  • 109.104.96.0/24
  • 109.104.98.0/24
  • 109.104.100.0/23
  • 109.104.105.0/24
  • 109.104.112.0/24
  • 109.104.114.0/24
  • 109.104.116.0/22
  • 109.104.122.0/23
  • 109.104.124.0/22
  • 178.251.233.0/24
  • 178.251.239.0/24
  • 185.5.88.0/22

IPv6 prefixes

All 1 prefix.

  • 2001:9d8::/32

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IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources