subnet.im

AS199803ComSource s.r.o.

CzechiaRegistryRIPE NCC

As of 11th November 2026, AS199803 (ComSource s.r.o.), a network registered in Czechia with RIPE NCC, originates 2 IPv4 prefixes covering 1.5k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 31,740th-largest of the 80,743 networks we see originating IPv4, and the 281st-largest of 576 in Czechia. It is seen behind 8 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS3356 (Lumen (Level 3)), and in front of 9 downstream networks. 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

2

IPv6 prefixes

1

IPv4 addresses

1.5k

IPv6 /64s

4.3B

Upstream graph

The networks AS199803 is seen behind, one and two hops out, drawn from real AS paths.

AS199803Toward the internet core
Upstream graph for AS199803: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS199803ComSource s.r.o.This networkAS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS6939Hurricane Electri…AS24482SG.GSAS32590Valve CorporationAS13030Init7 (Switzerlan…AS16552Tiggee LLCAS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS20130Depaul UniversityAS132337AxclusiveAS38623Metfone (Viettel …

Networks observed one and two hops upstream of AS199803 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

55

adjacent networks

Upstreams
815%
Peers
3869%
Downstreams
916%

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

Upstreams of AS199803
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer1,33864
AS3356Lumen (Level 3)USPeer1,05341
AS6939Hurricane Electric LLCUSPeer43150
AS32590Valve CorporationUSPeer302
AS24482SG.GSSGPeer302
AS24940Hetzner Online GmbHDEPeer282
AS132337AxclusiveSGAdjacent281
AS49544i3D.net B.VNLPeer282

Prefixes

The largest blocks AS199803 originates, widest first.

Largest prefixes originated by AS199803
PrefixAddressesVisibility
185.45.200.0/221k76/76
185.138.108.0/2351276/76
2a01:7fe0::/324.3B × /6463/63

Routing health

How AS199803'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%3
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 2 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS199803 started or stopped in this period.

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