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AS5610O2 Czech Republic, a.s.

CzechiaRegistryRIPE NCCTypeEyeball

As of 27th September 2026, AS5610 (O2 Czech Republic, a.s.), an access network registered in Czechia with RIPE NCC, originates 67 IPv4 prefixes covering 2.3M addresses and 5 IPv6 prefixes. By IPv4 address space that makes it the 238th-largest of the 79,525 networks we see originating IPv4, and the largest of 574 in Czechia. It is seen behind 15 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS174 (Cogent Communications, LLC), and in front of 41 downstream networks. 88% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

67

IPv6 prefixes

5

IPv4 addresses

2.3M

IPv6 /64s

51.5B

Upstream graph

The networks AS5610 is seen behind, one and two hops out, drawn from real AS paths.

AS5610Toward the internet core
Upstream graph for AS5610: 10 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS5610O2 Czech Republic…This networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS6939Hurricane Electri…AS32590Valve CorporationAS132337AxclusiveAS151326DCConnect Communi…AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS18106Viewqwest Pte LtdAS20130Depaul University

Networks observed one and two hops upstream of AS5610 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

140

adjacent networks

Upstreams
1511%
Peers
8460%
Downstreams
4129%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS5610
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer13,138122
AS174Cogent Communications, LLCUSPeer4,27291
AS6939Hurricane Electric LLCUSPeer1,49416
AS132337AxclusiveSGPeer2822
AS32590Valve CorporationUSPeer2692
AS24940Hetzner Online GmbHDEPeer2672
AS49544i3D.net B.VNLPeer2592
AS24482SG.GSSGPeer2562
AS8220COLTGBPeer2212
AS39392SH.cz s.r.o.CZPeer2525

Prefixes

All 72

The largest blocks AS5610 originates, widest first.

Largest prefixes originated by AS5610
PrefixAddressesVisibility
88.100.0.0/14262k80/81
90.180.0.0/14262k80/81
85.70.0.0/15131k80/81
85.160.0.0/15131k80/81
88.100.0.0/15131k80/81
90.178.0.0/15131k80/81
109.80.0.0/15131k80/81
80.188.0.0/1665.5k80/81
83.208.0.0/1665.5k80/81
85.70.0.0/1665.5k80/81

Routing health

How AS5610's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid87.5%63
  • Invalid0.0%0
  • No ROA12.5%9

Propagation

  • Globally propagated90% of full-feed peers or more100.0%72
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 67 prefixes

IPv6 — 5 prefixes

  • /2934.4B × /6420.0%1
  • /318.6B × /6420.0%1
  • /324.3B × /6440.0%2
  • /4865.5k × /6420.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS5610 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.