subnet.im

AS49870Alsycon B.V.

NetherlandsRegistryRIPE NCCTypeCarrier

As of 26th September 2026, AS49870 (Alsycon B.V.), a transit carrier registered in the Netherlands with RIPE NCC, originates 23 IPv4 prefixes covering 8.7k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 11,438th-largest of the 79,516 networks we see originating IPv4, and the 173rd-largest of 1,023 in the Netherlands. It is seen behind 17 upstream networks, most often AS57717 (FiberXpress BV) and AS174 (Cogent Communications, LLC), and in front of 5 downstream networks. 67% of its announcements have 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

23

IPv6 prefixes

1

IPv4 addresses

8.7k

IPv6 /64s

34.4B

Upstream graph

The networks AS49870 is seen behind, one and two hops out, drawn from real AS paths.

AS49870Toward the internet core
Upstream graph for AS49870: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS49870Alsycon B.V.This networkAS174Cogent Communicat…AS3257GTT Communication…AS6939Hurricane Electri…AS9002RETN LimitedAS57717FiberXpress BVAS1299Arelion (fka. Tel…AS151326DCConnect Communi…AS6667Elisa OyjAS398465Rackdog LLCAS18106Viewqwest Pte LtdAS20130Depaul UniversityAS33891Core-Backbone GmbH

Networks observed one and two hops upstream of AS49870 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

93

adjacent networks

Upstreams
1718%
Peers
7176%
Downstreams
55%

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

Upstreams of AS49870
NetworkCountryRelationshipPathsVantage pts
AS57717FiberXpress BVNLPeer1,61381
AS174Cogent Communications, LLCUSPeer62567
AS3257GTT Communications Inc.USPeer61944
AS6939Hurricane Electric LLCUSPeer23154
AS9002RETN LimitedGBPeer12775
AS13194UAB "Bite Lietuva"LTPeer2626
AS25091IP-Max SACHPeer173
AS39122Blacknight Internet Solutions LimitedIEPeer142
AS49544i3D.net B.VNLPeer142
AS8298IPng Networks GmbHCHPeer142

Prefixes

The largest blocks AS49870 originates, widest first.

Largest prefixes originated by AS49870
PrefixAddressesVisibility
160.119.64.0/221k81/81
196.61.64.0/221k81/81
45.80.36.0/2351281/81
45.81.22.0/2351281/81
45.95.144.0/2351281/81
45.140.222.0/2351281/81
160.119.76.0/2351281/81
2.56.167.0/2425681/81
45.95.146.0/2425681/81
45.95.147.0/2425681/81

Routing health

How AS49870'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

  • Valid66.7%16
  • Invalid0.0%0
  • No ROA33.3%8

Propagation

  • Globally propagated90% of full-feed peers or more100.0%24
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 23 prefixes

IPv6 — 1 prefixes

  • /2934.4B × /64100.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Withdrawn185.142.130.0/2421st Sept 2026

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