subnet.im

AS199803ComSource s.r.o.

CzechiaRegistryRIPE NCC

As of 27th September 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 31,105th-largest of the 79,516 networks we see originating IPv4, and the 278th-largest of 574 in Czechia. It is seen behind 10 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS3356 (Lumen (Level 3)), and in front of 10 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 CorporationAS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS38623Metfone (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

67

adjacent networks

Upstreams
1015%
Peers
4770%
Downstreams
1015%

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

Upstreams of AS199803
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer1,21459
AS3356Lumen (Level 3)USPeer1,19845
AS6939Hurricane Electric LLCUSPeer47559
AS32590Valve CorporationUSPeer312
AS49544i3D.net B.VNLPeer292
AS24482SG.GSSGPeer292
AS132337AxclusiveSGPeer291
AS24940Hetzner Online GmbHDEPeer292
AS262355VSX NetworksBRPeer11
AS22356Durand do Brasil LtdaBRPeer11

Prefixes

The largest blocks AS199803 originates, widest first.

Largest prefixes originated by AS199803
PrefixAddressesVisibility
185.45.200.0/221k81/81
185.138.108.0/2351281/81
2a01:7fe0::/324.3B × /6464/64

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 28th Aug 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.