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AS197451Brno University of Technology

CzechiaRegistryRIPE NCCTypeEyeball

As of 26th September 2026, AS197451 (Brno University of Technology), an access network registered in Czechia with RIPE NCC, originates 8 IPv4 prefixes covering 67.6k addresses and 4 IPv6 prefixes. By IPv4 address space that makes it the 3,259th-largest of the 79,516 networks we see originating IPv4, and the 17th-largest of 574 in Czechia. It is seen behind 3 upstream networks, most often AS15935 (ha-vel internet s.r.o.) and AS16019 (Vodafone Czech Republic a.s.), and in front of 9 downstream networks. 67% 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

8

IPv6 prefixes

4

IPv4 addresses

67.6k

IPv6 /64s

55.8B

Upstream graph

The networks AS197451 is seen behind, one and two hops out, drawn from real AS paths.

AS197451Toward the internet core
Upstream graph for AS197451: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS197451Brno University o…This networkAS2852CESNET z.s.p.o.AS15935ha-vel internet s…AS16019Vodafone Czech Re…AS21320GEANT VerenigingAS6939Hurricane Electri…AS9002RETN LimitedAS50263A-Systems Sp. z o…AS1273Vodafone Group PLC

Networks observed one and two hops upstream of AS197451 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

24

adjacent networks

Upstreams
313%
Peers
1250%
Downstreams
938%

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

Upstreams of AS197451
NetworkCountryRelationshipPathsVantage pts
AS15935ha-vel internet s.r.o.CZPeer1,17494
AS16019Vodafone Czech Republic a.s.CZPeer1,037112
AS2852CESNET z.s.p.o.CZPeer369144

Prefixes

The largest blocks AS197451 originates, widest first.

Largest prefixes originated by AS197451
PrefixAddressesVisibility
147.229.0.0/1732.8k81/81
147.229.128.0/1816.4k81/81
147.229.192.0/198.2k81/81
147.229.224.0/198.2k81/81
185.149.204.0/221k81/81
185.62.108.0/2351281/81
185.149.204.0/2425681/81
185.149.205.0/2425681/81
2a07:6bc0::/2934.4B × /6462/64
2a03:2e4::/3017.2B × /6463/64

Routing health

How AS197451'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

  • Valid66.7%8
  • Invalid0.0%0
  • No ROA33.3%4

Propagation

  • Globally propagated90% of full-feed peers or more100.0%12
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 8 prefixes

IPv6 — 4 prefixes

  • /2934.4B × /6425.0%1
  • /3017.2B × /6425.0%1
  • /324.3B × /6425.0%1
  • /46262k × /6425.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS197451 started or stopped in this period.

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