$ query “AS25577” --type=asn → 1 result(s)
AS25577 — C4L-AS
MAINFRAME & CYBERNETIC SYSTEMS LIMITED
AS25577 is a mid-size transit provider operated by MAINFRAME & CYBERNETIC SYSTEMS LIMITED, established in the United Kingdom in 2003. The network announces a respectable 51 456 IPv4 addresses. Supports IPv6.
- 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
- March 05, 2026
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 53 / 46
- IPv6 Prefixes (raw / aggregated)
- 1 / 1
- IPv4 Addresses
- 51 456
- Largest IPv4 Prefix
- /18 (16 384 addresses)
- Largest IPv6 Prefix
- /32
- Geolocated Countries
- 🇬🇧 GB (344 IPs), 🇹🇷 TR (2 IPs), 🇳🇱 NL (1 IPs), 🇩🇪 DE, 🇨🇬 CG
- Prefix Changed
- March 04, 2026
Reputation
- Reputation
- Pristine — 0 flagged IPs out of 51 456 total (0.00%)
Connectivity Summary
- Upstream Providers
- 2 upstream autonomous systems providing transit
- Peers
- 30 autonomous systems exchanging traffic without transit fees
- Downstream Customers
- 15 downstream autonomous systems buying transit
- Degree
- 49 unique BGP neighbors (providers + customers + peers)
- Reach
- 24 — customer cone size measuring network influence
- Degree Rank
- #3 002
- Reach Rank
- #2 097
Upstream Providers (2)
Prefix Lists
IPv4 Prefixes (53 total)
- 84.45.64.0/18 (16 384 addresses)
- 84.45.32.0/19 (8 192 addresses)
- 84.45.16.0/20 (4 096 addresses)
- 81.27.88.0/21 (2 048 addresses)
- 84.45.8.0/21 (2 048 addresses)
- 109.104.120.0/21 (2 048 addresses)
- 5.133.184.0/22 (1 024 addresses)
- 37.58.24.0/22 (1 024 addresses)
- 81.27.80.0/22 (1 024 addresses)
- 109.104.116.0/22 (1 024 addresses)
- 185.5.88.0/22 (1 024 addresses)
- 5.133.188.0/23 (512 addresses)
- 31.3.212.0/23 (512 addresses)
- 78.40.56.0/23 (512 addresses)
- 81.27.66.0/23 (512 addresses)
- 81.27.72.0/23 (512 addresses)
- 85.159.90.0/23 (512 addresses)
- 109.68.64.0/23 (512 addresses)
- 109.104.96.0/23 (512 addresses)
- 109.104.100.0/23 (512 addresses)
- 185.229.20.0/23 (512 addresses)
- 5.133.191.0/24 (256 addresses)
- 31.3.208.0/24 (256 addresses)
- 31.3.211.0/24 (256 addresses)
- 31.3.221.0/24 (256 addresses)
- 31.3.223.0/24 (256 addresses)
- 37.58.29.0/24 (256 addresses)
- 62.69.143.0/24 (256 addresses)
- 77.73.11.0/24 (256 addresses)
- 77.73.12.0/24 (256 addresses)
- 77.73.15.0/24 (256 addresses)
- 78.40.61.0/24 (256 addresses)
- 81.27.64.0/24 (256 addresses)
- 81.27.75.0/24 (256 addresses)
- 81.27.76.0/24 (256 addresses)
- 81.27.87.0/24 (256 addresses)
- 82.197.72.0/24 (256 addresses)
- 85.159.88.0/24 (256 addresses)
- 85.159.95.0/24 (256 addresses)
- 109.68.68.0/24 (256 addresses)
- 109.104.98.0/24 (256 addresses)
- 109.104.105.0/24 (256 addresses)
- 109.104.112.0/24 (256 addresses)
- 109.104.114.0/24 (256 addresses)
- 178.251.233.0/24 (256 addresses)
- 178.251.239.0/24 (256 addresses)
IPv6 Prefixes (1 total)
- 2001:9d8::/32