subnet.im

AS21215UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd

SerbiaRegistryRIPE NCC

As of 27th September 2026, AS21215 (UNITED GROUP NETWORK INFRASTRUCTURE…), a network registered in Serbia with RIPE NCC, originates 8 IPv4 prefixes covering 12.5k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 9,280th-largest of the 79,516 networks we see originating IPv4, and the 17th-largest of 159 in Serbia. It is seen behind 47 upstream networks, most often AS174 (Cogent Communications, LLC) and AS3356 (Lumen (Level 3)), and in front of 8 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

8

IPv6 prefixes

1

IPv4 addresses

12.5k

IPv6 /64s

34.4B

Upstream graph

The networks AS21215 is seen behind, one and two hops out, drawn from real AS paths.

AS21215Toward the internet core
Upstream graph for AS21215: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS21215UNITED GROUP NETW…This networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS7713PT Telkom Indones…AS13030Init7 (Switzerlan…AS151326DCConnect Communi…AS8888xTom Pty LtdAS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS6453TATA Communicatio…AS35280F5 Networks SARLAS56662Marcin Gondek

Networks observed one and two hops upstream of AS21215 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

851

adjacent networks

Upstreams
476%
Peers
79694%
Downstreams
81%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 47.

Upstreams of AS21215
NetworkCountryRelationshipPathsVantage pts
AS174Cogent Communications, LLCUSPeer4,02122
AS3356Lumen (Level 3)USPeer3,81840
AS1299Arelion (fka. Telia Carrier)SEPeer3,52240
AS7713PT Telkom Indonesia TbkIDPeer5383
AS13030Init7 (Switzerland) Ltd.CHPeer4904
AS6830Liberty Global Europe Holding B.V.EUPeer4603
AS132337AxclusiveSGPeer4252
AS49544i3D.net B.VNLPeer3873
AS32590Valve CorporationUSPeer3473
AS8455atom86 BVNLPeer3462

Prefixes

The largest blocks AS21215 originates, widest first.

Largest prefixes originated by AS21215
PrefixAddressesVisibility
213.244.208.0/204.1k80/81
89.207.192.0/212k80/81
176.109.136.0/212k80/81
185.13.8.0/221k80/81
185.18.12.0/221k80/81
185.20.36.0/221k81/81
185.81.60.0/221k80/81
5.22.166.0/2425680/81
2a03:dd80::/2934.4B × /6463/64

Routing health

How AS21215'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%9
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%9
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 8 prefixes

IPv6 — 1 prefixes

  • /2934.4B × /64100.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS21215 started or stopped in this period.

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