subnet.im

AS39251NETGUARD LLC

BulgariaRegistryRIPE NCCTypeEyeball

As of 26th September 2026, AS39251 (NETGUARD LLC), an access network registered in Bulgaria with RIPE NCC, originates 73 IPv4 prefixes covering 29.4k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 5,740th-largest of the 79,516 networks we see originating IPv4, and the 27th-largest of 669 in Bulgaria. It is seen behind 15 upstream networks, most often AS3356 (Lumen (Level 3)) and AS174 (Cogent Communications, LLC), and in front of 4 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

73

IPv6 prefixes

1

IPv4 addresses

29.4k

IPv6 /64s

4.3B

Upstream graph

The networks AS39251 is seen behind, one and two hops out, drawn from real AS paths.

AS39251Toward the internet core
Upstream graph for AS39251: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS39251NETGUARD LLCThis networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS3257GTT Communication…AS3356Lumen (Level 3)AS6939Hurricane Electri…AS151326DCConnect Communi…AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS6667Elisa OyjAS398465Rackdog LLCAS2914NTT America, Inc.AS3549Lumen (fka. Globa…

Networks observed one and two hops upstream of AS39251 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

91

adjacent networks

Upstreams
1516%
Peers
7279%
Downstreams
44%

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

Upstreams of AS39251
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer1,51947
AS174Cogent Communications, LLCUSPeer1,41856
AS1299Arelion (fka. Telia Carrier)SEPeer1,41543
AS3257GTT Communications Inc.USPeer1,09965
AS6939Hurricane Electric LLCUSPeer44861
AS25091IP-Max SACHPeer1602
AS49544i3D.net B.VNLPeer822
AS14537Continent 8 LLCUSPeer801
AS3303Swisscom (Schweiz) AGCHPeer801
AS24482SG.GSSGPeer801

Prefixes

All 74

The largest blocks AS39251 originates, widest first.

Largest prefixes originated by AS39251
PrefixAddressesVisibility
77.76.16.0/204.1k80/81
91.92.72.0/212k80/81
85.130.72.0/221k80/81
91.92.80.0/221k80/81
91.92.92.0/221k80/81
185.225.84.0/221k80/81
185.229.252.0/221k80/81
213.232.88.0/221k80/81
91.207.190.0/2351280/81
195.238.84.0/2351280/81

Routing health

How AS39251'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%74
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%74
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 73 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS39251 started or stopped in this period.

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