$ query “AS24971” --type=asn → 1 result(s)

AS24971 · MASTER-AS

MasterDC s.r.o.

AS24971 is operated by MasterDC s.r.o. and serves as a mid-size transit provider, established in Czechia in 2002. The system announces a respectable 58 880 IPv4 addresses, and supports IPv6. The bulk of its IP address space is in Czechia, with additional presence in the Netherlands and Slovakia.

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

Basic Information

Country
🇨🇿 Czechia
Category
Hosting
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
June 11, 2002
Last Changed
March 04, 2026
Last Seen
April 29, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
33 / 31
IPv6 Prefixes (raw / aggregated)
13 / 11
IPv4 Addresses
58 880
Largest IPv4 Prefix
/19 (8 192 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇨🇿 Czechia (115 712 IPs), 🇳🇱 Netherlands (256 IPs), 🇸🇰 Slovakia (16 IPs)
Prefix Changed
March 04, 2026

Reputation

Reputation
Good — 3 flagged IPs out of 58 880 total (0.01%)
Open Proxies
1 known open proxies in this network

Connectivity Summary

Upstream Providers
3 upstreams providing transit
Peers
24 networks exchanging traffic without transit
Downstream Customers
7 downstreams buying transit
Unclassified
1 unclassified BGP neighbor
Degree
35 unique BGP neighbors
Reach
14 networks in customer cone

Upstream Providers (3)

Prefix Lists

IPv4 Prefixes (33 total)

  • 77.93.192.0/19 (8 192 addresses (/19 prefix))
  • 89.185.224.0/19 (8 192 addresses (/19 prefix))
  • 83.167.224.0/19 (8 192 addresses (/19 prefix))
  • 178.238.32.0/20 (4 096 addresses (/20 prefix))
  • 81.31.32.0/20 (4 096 addresses (/20 prefix))
  • 80.79.16.0/20 (4 096 addresses (/20 prefix))
  • 149.62.144.0/21 (2 048 addresses (/21 prefix))
  • 37.205.8.0/21 (2 048 addresses (/21 prefix))
  • 85.118.128.0/21 (2 048 addresses (/21 prefix))
  • 185.8.164.0/22 (1 024 addresses (/22 prefix))
  • 195.140.252.0/22 (1 024 addresses (/22 prefix))
  • 91.214.192.0/22 (1 024 addresses (/22 prefix))
  • 185.145.160.0/22 (1 024 addresses (/22 prefix))
  • 91.226.216.0/22 (1 024 addresses (/22 prefix))
  • 185.85.164.0/22 (1 024 addresses (/22 prefix))
  • 185.58.40.0/22 (1 024 addresses (/22 prefix))
  • 194.145.180.0/22 (1 024 addresses (/22 prefix))
  • 185.32.160.0/22 (1 024 addresses (/22 prefix))
  • 185.239.216.0/22 (1 024 addresses (/22 prefix))
  • 5.180.200.0/22 (1 024 addresses (/22 prefix))
  • 185.25.184.0/22 (1 024 addresses (/22 prefix))
  • 176.227.168.0/23 (512 addresses (/23 prefix))
  • 188.213.234.0/23 (512 addresses (/23 prefix))
  • 188.215.18.0/23 (512 addresses (/23 prefix))
  • 193.169.160.0/23 (512 addresses (/23 prefix))
  • 83.223.52.0/24 (256 addresses (/24 prefix))
  • 130.193.16.0/24 (256 addresses (/24 prefix))
  • 92.63.56.0/24 (256 addresses (/24 prefix))
  • 91.216.179.0/24 (256 addresses (/24 prefix))
  • 91.213.160.0/24 (256 addresses (/24 prefix))
  • 37.140.220.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (13 total)

  • 2a07:4880::/29
  • 2a0c:6380::/29
  • 2a00:8220::/32
  • 2a00:a5a0::/32
  • 2a01:430::/32
  • 2a03:7460::/32
  • 2a0b:3240::/32
  • 2a03:3b40::/38
  • 2001:678:a50::/48
  • 2001:67c:68::/48
  • 2a04:16c0:200::/48