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AS61983Instytut Meteorologii i Gospodarki Wodnej - Panstwowy Instytut Badawczy

PolandRegistryRIPE NCC

As of 10th November 2026, AS61983 (Instytut Meteorologii i Gospodarki…), a network registered in Poland with RIPE NCC, originates 1 IPv4 prefix covering 256 addresses. By IPv4 address space that makes it the 59,962nd-largest of the 80,733 networks we see originating IPv4, and the 1,351st-largest of 2,109 in Poland. It is seen behind 1 upstream network, most often AS12912 (T-Mobile Polska S.A.). None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

1

IPv6 prefixes

0

IPv4 addresses

256

IPv6 /64s

0

Upstream graph

The networks AS61983 is seen behind, one and two hops out, drawn from real AS paths.

AS61983Toward the internet core
Upstream graph for AS61983: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS61983Instytut Meteorol…This networkAS12912T-Mobile Polska S…AS1299Arelion (fka. Tel…AS33891Core-Backbone GmbH

Networks observed one and two hops upstream of AS61983 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

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

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

Upstreams of AS61983
NetworkCountryRelationshipPathsVantage pts
AS12912T-Mobile Polska S.A.PLPeer7676

Prefixes

The largest blocks AS61983 originates, widest first.

Largest prefixes originated by AS61983
PrefixAddressesVisibility
91.220.17.0/2425676/76

Routing health

How AS61983'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

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%1
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS61983 started or stopped in this period.

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