subnet.im

AS19108Optimum

United StatesRegistryARINTypeEyeball

As of 27th September 2026, AS19108 (Optimum), an access network registered in the United States with ARIN, originates 408 IPv4 prefixes covering 7M addresses and 26 IPv6 prefixes. By IPv4 address space that makes it the 107th-largest of the 79,525 networks we see originating IPv4, and the 31st-largest of 18,428 in the United States. It is seen behind 12 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS3356 (Lumen (Level 3)), and in front of 73 downstream networks. 6% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 89% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

408

IPv6 prefixes

26

IPv4 addresses

7M

IPv6 /64s

7.5B

Upstream graph

The networks AS19108 is seen behind, one and two hops out, drawn from real AS paths.

AS19108Toward the internet core
Upstream graph for AS19108: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS19108OptimumThis networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS6939Hurricane Electri…AS18106Viewqwest Pte LtdAS151326DCConnect Communi…AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS20130Depaul UniversityAS215859Hetzner Cloud - S…

Networks observed one and two hops upstream of AS19108 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

187

adjacent networks

Upstreams
126%
Peers
10255%
Downstreams
7339%

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

Upstreams of AS19108
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer18,952132
AS3356Lumen (Level 3)USPeer17,288109
AS174Cogent Communications, LLCUSPeer7,221102
AS6939Hurricane Electric LLCUSPeer1,97612
AS18106Viewqwest Pte LtdSGPeer1,2642
AS58511Swoop (Anycast Global Backbone)AUPeer6401
AS49544i3D.net B.VNLPeer6062
AS3303Swisscom (Schweiz) AGCHPeer5371
AS4826Vocus Connect International BackboneAUPeer4942
AS5650Verizon (fka. Frontier)USPeer16080

Prefixes

All 434

The largest blocks AS19108 originates, widest first.

Largest prefixes originated by AS19108
PrefixAddressesVisibility
47.208.0.0/121M79/81
47.212.0.0/14262k80/81
47.220.0.0/14262k80/81
50.24.0.0/14262k80/81
74.192.0.0/14262k79/81
75.108.0.0/14262k79/81
47.208.0.0/15131k80/81
47.210.0.0/15131k80/81
47.218.0.0/15131k80/81
74.192.0.0/15131k80/81

Routing health

How AS19108'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

  • Valid5.8%25
  • Invalid0.0%0
  • No ROA94.2%409

Propagation

  • Globally propagated90% of full-feed peers or more89.2%387
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%10.8%47

Prefix sizes

IPv4 — 408 prefixes

IPv6 — 26 prefixes

  • /324.3B × /643.8%1
  • /332.1B × /643.8%1
  • /36268M × /6415.4%4
  • /441M × /6415.4%4
  • /4865.5k × /6461.5%16

Recent changes

Announcements that started or stopped since 28th Aug 2026.

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