subnet.im

AS109CISCO SYSTEMS, INC.

United StatesRegistryARIN

As of 23rd October 2026, AS109 (CISCO SYSTEMS, INC.), a network registered in the United States with ARIN, originates 96 IPv4 prefixes covering 1.6M addresses and 47 IPv6 prefixes. By IPv4 address space that makes it the 336th-largest of the 79,658 networks we see originating IPv4, and the 79th-largest of 18,483 in the United States. It is seen behind 19 upstream networks, most often AS3356 (Lumen (Level 3)) and AS6939 (Hurricane Electric LLC). 97% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. Over 99% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

96

IPv6 prefixes

47

IPv4 addresses

1.6M

IPv6 /64s

5.4B

Upstream graph

The networks AS109 is seen behind, one and two hops out, drawn from real AS paths.

AS109Toward the internet core
Upstream graph for AS109: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS109CISCO SYSTEMS, IN…This networkAS3356Lumen (Level 3)AS3491PCCW Global (HK) …AS4637Telstra Internati…AS6939Hurricane Electri…AS9498Bharti Airtel Ltd.AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS24516Virtutel Pty LtdAS16552Tiggee LLCAS32590Valve CorporationAS20130Depaul UniversityAS132337Axclusive

Networks observed one and two hops upstream of AS109 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

39

adjacent networks

Upstreams
1949%
Peers
2051%
Downstreams
00%

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

Upstreams of AS109
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer3,094138
AS6939Hurricane Electric LLCUSPeer2,248140
AS4637Telstra International LimitedHKPeer66782
AS3491PCCW Global (HK) Ltd.HKPeer55858
AS9498Bharti Airtel Ltd.INPeer51577
AS4755TATA Communications (formerly VSNL)INPeer40267
AS1221Telstra LimitedAUPeer395139
AS1299Arelion (fka. Telia Carrier)SEPeer34352
AS4812China Telecom Shanghai Province NetworkCNPeer32668
AS4657StarHub LtdSGPeer32594

Prefixes

All 143

The largest blocks AS109 originates, widest first.

Largest prefixes originated by AS109
PrefixAddressesVisibility
171.68.0.0/14262k77/77
173.36.0.0/14262k77/77
64.100.0.0/1665.5k77/77
64.102.0.0/1665.5k77/77
64.103.0.0/1665.5k77/77
64.104.0.0/1665.5k77/77
72.163.0.0/1665.5k77/77
128.107.0.0/1665.5k77/77
144.254.0.0/1665.5k77/77
161.44.0.0/1665.5k77/77

Routing health

How AS109'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

  • Valid97.2%139
  • Invalid0.0%0
  • No ROA2.8%4

Propagation

  • Globally propagated90% of full-feed peers or more99.3%142
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.7%1

Prefix sizes

IPv4 — 96 prefixes

IPv6 — 47 prefixes

  • /324.3B × /642.1%1
  • /35537M × /642.1%1
  • /36268M × /642.1%1
  • /3933.6M × /6417.0%8
  • /4016.8M × /646.4%3
  • /418.4M × /646.4%3
  • /45524k × /644.3%2
  • /46262k × /6427.7%13
  • /47131k × /644.3%2
  • /4865.5k × /6427.7%13

Recent changes

Announcements that started or stopped since 24th Sept 2026.

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