Autonomous System
AS25577 MAINFRAME & CYBERNETIC SYSTEMS LIMITED
BusinessActiveUnited KingdomRIPE
AS25577 (C4L-AS) is a business network operated by MAINFRAME & CYBERNETIC SYSTEMS LIMITED in United Kingdom, registered with RIPE. It has 52 IPv4 prefixes with 54,784 addresses and 1 IPv6 prefix, which makes it the 4,163rd largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses54,784in 52 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#4,163of 82,200 active ASNs
Details
OrganizationMAINFRAME & CYBERNETIC SYSTEMS LIMITED
AS nameC4L-AS
Websitemainframe.co.uk
Country United Kingdom (GB)
Network typeBusiness
RegistryRIPE
Abuse contactfrank@bec.uk
Registered2003-01-15
Last updated2026-03-03
IPv4 prefixes
52 prefixes · 54,784 addresses| Network | Addresses | First – last address |
|---|---|---|
| 84.45.64.0/18 | 16,384 | 84.45.64.0 – 84.45.127.255 |
| 84.45.32.0/19 | 8,192 | 84.45.32.0 – 84.45.63.255 |
| 84.45.16.0/20 | 4,096 | 84.45.16.0 – 84.45.31.255 |
| 81.27.88.0/21 | 2,048 | 81.27.88.0 – 81.27.95.255 |
| 84.45.8.0/21 | 2,048 | 84.45.8.0 – 84.45.15.255 |
| 109.104.120.0/21 | 2,048 | 109.104.120.0 – 109.104.127.255 |
| 5.133.184.0/22 | 1,024 | 5.133.184.0 – 5.133.187.255 |
| 37.58.24.0/22 | 1,024 | 37.58.24.0 – 37.58.27.255 |
| 81.27.80.0/22 | 1,024 | 81.27.80.0 – 81.27.83.255 |
| 81.27.88.0/22 | 1,024 | 81.27.88.0 – 81.27.91.255 |
| 109.104.116.0/22 | 1,024 | 109.104.116.0 – 109.104.119.255 |
| 109.104.124.0/22 | 1,024 | 109.104.124.0 – 109.104.127.255 |
| 185.5.88.0/22 | 1,024 | 185.5.88.0 – 185.5.91.255 |
| 5.133.188.0/23 | 512 | 5.133.188.0 – 5.133.189.255 |
| 31.3.212.0/23 | 512 | 31.3.212.0 – 31.3.213.255 |
| 78.40.56.0/23 | 512 | 78.40.56.0 – 78.40.57.255 |
| 81.27.66.0/23 | 512 | 81.27.66.0 – 81.27.67.255 |
| 81.27.72.0/23 | 512 | 81.27.72.0 – 81.27.73.255 |
| 81.27.92.0/23 | 512 | 81.27.92.0 – 81.27.93.255 |
| 85.159.90.0/23 | 512 | 85.159.90.0 – 85.159.91.255 |
| 109.68.64.0/23 | 512 | 109.68.64.0 – 109.68.65.255 |
| 109.104.96.0/23 | 512 | 109.104.96.0 – 109.104.97.255 |
| 109.104.100.0/23 | 512 | 109.104.100.0 – 109.104.101.255 |
| 109.104.122.0/23 | 512 | 109.104.122.0 – 109.104.123.255 |
| 5.133.191.0/24 | 256 | 5.133.191.0 – 5.133.191.255 |
84.45.64.0/18 84.45.32.0/19 84.45.16.0/20 81.27.88.0/21 84.45.8.0/21 109.104.120.0/21 5.133.184.0/22 37.58.24.0/22 81.27.80.0/22 81.27.88.0/22 109.104.116.0/22 109.104.124.0/22 185.5.88.0/22 5.133.188.0/23 31.3.212.0/23 78.40.56.0/23 81.27.66.0/23 81.27.72.0/23 81.27.92.0/23 85.159.90.0/23 109.68.64.0/23 109.104.96.0/23 109.104.100.0/23 109.104.122.0/23 5.133.191.0/24
The 25 largest of 52. The API and the database have all of them.
IPv6 prefixes
1 prefix- 2001:9d8::/32
2001:9d8::/32
Query AS25577 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS25577&key=YOUR_API_KEY"Any address in its prefixes resolves to AS25577, with or without a key:
curl "https://api.ipapi.is/?q=84.45.64.1"