subnet.im

AS28725CETIN a.s.

CzechiaRegistryRIPE NCCTypeEyeball

As of 26th September 2026, AS28725 (CETIN a.s.), an access network registered in Czechia with RIPE NCC, originates 9 IPv4 prefixes covering 265k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 1,072nd-largest of the 79,516 networks we see originating IPv4, and the 8th-largest of 574 in Czechia. It is seen behind 43 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS174 (Cogent Communications, LLC), and in front of 36 downstream networks. 91% 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

9

IPv6 prefixes

2

IPv4 addresses

265k

IPv6 /64s

38.7B

Upstream graph

The networks AS28725 is seen behind, one and two hops out, drawn from real AS paths.

AS28725Toward the internet core
Upstream graph for AS28725: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS28725CETIN a.s.This networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS6939Hurricane Electri…AS7713PT Telkom Indones…AS13030Init7 (Switzerlan…AS151326DCConnect Communi…AS8888xTom Pty LtdAS18106Viewqwest Pte LtdAS20130Depaul UniversityAS6453TATA Communicatio…AS35280F5 Networks SARLAS56662Marcin Gondek

Networks observed one and two hops upstream of AS28725 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

326

adjacent networks

Upstreams
4313%
Peers
24776%
Downstreams
3611%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 43.

Upstreams of AS28725
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer4,01678
AS174Cogent Communications, LLCUSPeer1,24436
AS6939Hurricane Electric LLCUSPeer45611
AS13030Init7 (Switzerland) Ltd.CHPeer3624
AS7713PT Telkom Indonesia TbkIDPeer3273
AS18106Viewqwest Pte LtdSGPeer3014
AS14537Continent 8 LLCUSPeer2583
AS32590Valve CorporationUSPeer2403
AS38880Micron21 Datacentre Pty LtdAUPeer2352
AS8888xTom Pty LtdAUPeer2042

Prefixes

The largest blocks AS28725 originates, widest first.

Largest prefixes originated by AS28725
PrefixAddressesVisibility
85.162.0.0/15131k80/81
85.162.0.0/1665.5k80/81
85.163.0.0/1665.5k80/81
194.50.64.0/221k80/81
194.147.12.0/221k80/81
185.218.92.0/2351280/81
80.78.150.0/2425680/81
136.238.226.0/2425680/81
212.96.180.0/2425680/81
2a07:1f40::/2934.4B × /6463/64

Routing health

How AS28725'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

  • Valid90.9%10
  • Invalid0.0%0
  • No ROA9.1%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%11
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 9 prefixes

IPv6 — 2 prefixes

  • /2934.4B × /6450.0%1
  • /324.3B × /6450.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS28725 started or stopped in this period.

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