$ query “AS5610” --type=asn → 1 result(s)

AS5610 · O2-CZECH-REPUBLIC

O2 Czech Republic a.s.

AS5610 is run by O2 Czech Republic a.s. and is a mid-size transit provider, established in Czechia in 2002. The system announces an impressive 1.5 million IPv4 addresses, including a /14, and supports IPv6. The bulk of its IP address space is in Czechia, with additional presence in Slovakia and France, and smaller footprints in 4 additional countries.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #7 in Czechia — Top 10 by reach within country

Basic Information

Country
🇨🇿 Czechia
Category
Internet Service Provider
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
July 22, 2002
Last Changed
March 04, 2026
Last Seen
April 16, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
67 / 35
IPv6 Prefixes (raw / aggregated)
5 / 4
IPv4 Addresses
1 542 400
Largest IPv4 Prefix
/14 (262 144 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇨🇿 Czechia (2 813 280 IPs), 🇸🇰 Slovakia (32 768 IPs), 🇫🇷 France (512 IPs) and 4 more
Prefix Changed
March 04, 2026

Reputation

Reputation
Good — 15 flagged IPs out of 1 542 400 total (0.00%)

Connectivity Summary

Upstream Providers
2 upstreams providing transit
Peers
23 networks exchanging traffic without transit
Downstream Customers
39 downstreams buying transit
Unclassified
2 unclassified BGP neighbors
Degree
66 unique BGP neighbors
Reach
80 networks in customer cone

Upstream Providers (2)

  • AS174 — COGENT-174 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (67 total)

  • 90.180.0.0/14 (262 144 addresses (/14 prefix))
  • 88.100.0.0/14 (262 144 addresses (/14 prefix))
  • 85.70.0.0/15 (131 072 addresses (/15 prefix))
  • 85.160.0.0/15 (131 072 addresses (/15 prefix))
  • 109.80.0.0/15 (131 072 addresses (/15 prefix))
  • 90.178.0.0/15 (131 072 addresses (/15 prefix))
  • 194.228.0.0/16 (65 536 addresses (/16 prefix))
  • 160.218.0.0/16 (65 536 addresses (/16 prefix))
  • 83.208.0.0/16 (65 536 addresses (/16 prefix))
  • 80.188.0.0/16 (65 536 addresses (/16 prefix))
  • 90.177.0.0/16 (65 536 addresses (/16 prefix))
  • 90.176.128.0/17 (32 768 addresses (/17 prefix))
  • 37.188.128.0/17 (32 768 addresses (/17 prefix))
  • 85.193.0.0/18 (16 384 addresses (/18 prefix))
  • 91.191.64.0/18 (16 384 addresses (/18 prefix))
  • 90.176.64.0/18 (16 384 addresses (/18 prefix))
  • 83.69.32.0/19 (8 192 addresses (/19 prefix))
  • 88.83.160.0/19 (8 192 addresses (/19 prefix))
  • 90.176.32.0/19 (8 192 addresses (/19 prefix))
  • 92.243.192.0/19 (8 192 addresses (/19 prefix))
  • 217.194.160.0/20 (4 096 addresses (/20 prefix))
  • 217.117.208.0/20 (4 096 addresses (/20 prefix))
  • 81.90.160.0/20 (4 096 addresses (/20 prefix))
  • 91.193.132.0/22 (1 024 addresses (/22 prefix))
  • 193.84.12.0/22 (1 024 addresses (/22 prefix))
  • 185.61.228.0/22 (1 024 addresses (/22 prefix))
  • 185.143.112.0/22 (1 024 addresses (/22 prefix))
  • 194.50.248.0/23 (512 addresses (/23 prefix))
  • 91.213.10.0/24 (256 addresses (/24 prefix))
  • 193.17.13.0/24 (256 addresses (/24 prefix))
  • 194.165.47.0/24 (256 addresses (/24 prefix))
  • 161.195.144.0/24 (256 addresses (/24 prefix))
  • 195.5.186.0/24 (256 addresses (/24 prefix))
  • 5.23.39.0/24 (256 addresses (/24 prefix))
  • 91.232.82.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (5 total)

  • 2a00:1028::/29
  • 2a02:9b8::/31
  • 2001:41d8::/32
  • 2001:67c:dd4::/48