subnet.im

AS219251Tomasz Walter

PolandRegistryRIPE NCC

As of 26th September 2026, AS219251 (Tomasz Walter), a network registered in Poland with RIPE NCC, originates 2 IPv6 prefixes. It is seen behind 3 upstream networks, most often AS209735 (Lagrange Cloud Technologies Limited) and AS214762 (Sebastian Stefanek trading as MatHost.eu). Every one of its announcements has 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

0

IPv6 prefixes

2

IPv4 addresses

0

IPv6 /64s

1.1M

Upstream graph

The networks AS219251 is seen behind, one and two hops out, drawn from real AS paths.

AS219251Toward the internet core
Upstream graph for AS219251: 7 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS219251Tomasz WalterThis networkAS209533iFog GmbH - BGPTu…AS209735Lagrange Cloud Te…AS214762Sebastian Stefane…AS34927iFog GmbHAS6939Hurricane Electri…AS44355Colocation LtdAS6204TMRC GROUP SRL

Networks observed one and two hops upstream of AS219251 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

7

adjacent networks

Upstreams
343%
Peers
457%
Downstreams
00%

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

Upstreams of AS219251
NetworkCountryRelationshipPathsVantage pts
AS209735Lagrange Cloud Technologies LimitedGBPeer11260
AS214762Sebastian Stefanek trading as MatHost.euPLPeer1010
AS209533iFog GmbH - BGPTunnelCHPeer43

Prefixes

The largest blocks AS219251 originates, widest first.

Largest prefixes originated by AS219251
PrefixAddressesVisibility
2a0b:4e07:260::/441M × /6463/64
2a06:9801:7df::/4865.5k × /6463/64

Routing health

How AS219251'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

  • Valid100.0%2
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%2
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv6 — 2 prefixes

  • /441M × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS219251 started or stopped in this period.

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