subnet.im

AS15305Syringa Networks, LLC

United StatesRegistryARINTypeEyeball

As of 26th September 2026, AS15305 (Syringa Networks, LLC), an access network registered in the United States with ARIN, originates 26 IPv4 prefixes covering 55k addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 4,257th-largest of the 79,516 networks we see originating IPv4, and the 1,533rd-largest of 18,424 in the United States. It is seen behind 13 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS209 (Lumen (ex. Qwest)), and in front of 54 downstream networks. 3% of its announcements have a valid RPKI ROA; 2 are RPKI-invalid. 93% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

26

IPv6 prefixes

3

IPv4 addresses

55k

IPv6 /64s

5.4B

Upstream graph

The networks AS15305 is seen behind, one and two hops out, drawn from real AS paths.

AS15305Toward the internet core
Upstream graph for AS15305: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS15305Syringa Networks,…This networkAS209Lumen (ex. Qwest)AS1299Arelion (fka. Tel…AS6939Hurricane Electri…AS18106Viewqwest Pte LtdAS38880Micron21 Datacent…AS3356Lumen (Level 3)AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS20130Depaul UniversityAS215859Hetzner Cloud - S…AS2914NTT America, Inc.AS9002RETN Limited

Networks observed one and two hops upstream of AS15305 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

156

adjacent networks

Upstreams
138%
Peers
8957%
Downstreams
5435%

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

Upstreams of AS15305
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer12,36381
AS209Lumen (ex. Qwest)USPeer2,89920
AS6939Hurricane Electric LLCUSPeer1,78755
AS18106Viewqwest Pte LtdSGPeer9072
AS38880Micron21 Datacentre Pty LtdAUPeer9043
AS14537Continent 8 LLCUSPeer6724
AS58511Swoop (Anycast Global Backbone)AUPeer4332
AS49544i3D.net B.VNLPeer3912
AS3303Swisscom (Schweiz) AGCHPeer2951
AS174Cogent Communications, LLCUSPeer385

Prefixes

All 29

The largest blocks AS15305 originates, widest first.

Largest prefixes originated by AS15305
PrefixAddressesVisibility
208.98.128.0/1816.4k81/81
66.232.64.0/198.2k81/81
67.215.32.0/204.1k81/81
161.115.208.0/204.1k81/81
173.224.176.0/204.1k81/81
209.141.112.0/204.1k81/81
216.182.96.0/204.1k81/81
64.136.100.0/221k81/81
104.245.20.0/221k81/81
158.120.248.0/221k81/81

Routing health

How AS15305'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

  • Valid3.4%1
  • Invalid6.9%2
  • No ROA89.7%26

Propagation

  • Globally propagated90% of full-feed peers or more93.1%27
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%6.9%2

Prefix sizes

IPv4 — 26 prefixes

IPv6 — 3 prefixes

  • /324.3B × /6433.3%1
  • /35537M × /6466.7%2

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS15305 started or stopped in this period.

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