subnet.im

AS18723Seagate Technology LLC

United StatesRegistryARIN

As of 12th November 2026, AS18723 (Seagate Technology LLC), a network registered in the United States with ARIN, originates 22 IPv4 prefixes covering 8.2k addresses. By IPv4 address space that makes it the 12,075th-largest of the 80,772 networks we see originating IPv4, and the 3,588th-largest of 18,759 in the United States. It is seen behind 7 upstream networks, most often AS3356 (Lumen (Level 3)) and AS3257 (GTT Communications Inc.), and in front of 2 downstream networks. None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers, and 2 prefixes are also originated by another network.

At a glance

IPv4 prefixes

22

IPv6 prefixes

0

IPv4 addresses

8.2k

IPv6 /64s

0

Upstream graph

The networks AS18723 is seen behind, one and two hops out, drawn from real AS paths.

AS18723Toward the internet core
Upstream graph for AS18723: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS18723Seagate Technolog…This networkAS3257GTT Communication…AS3356Lumen (Level 3)AS9255Singapore TelecomAS9498Bharti Airtel Ltd.AS45458SBN-ISP/AWN-ISP a…AS6667Elisa OyjAS398465Rackdog LLCAS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS3758SingNetAS23884Proen Corp Public…AS45430SBN-IIG/AWN-IIG t…

Networks observed one and two hops upstream of AS18723 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

20

adjacent networks

Upstreams
735%
Peers
1155%
Downstreams
210%

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

Upstreams of AS18723
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer1,06778
AS3257GTT Communications Inc.USPeer33078
AS45458SBN-ISP/AWN-ISP and SBN-NIX/AWN-NIXTHPeer15477
AS9255Singapore TelecomSGPeer7878
AS9498Bharti Airtel Ltd.INPeer5050
AS2687AT&T Enterprises, LLCUSPeer2828
AS5580GTT Communications (APAC)NLPeer72

Prefixes

The largest blocks AS18723 originates, widest first.

Largest prefixes originated by AS18723
PrefixAddressesVisibility
134.204.178.0/2351278/78
134.204.180.0/2351278/78
134.204.182.0/2351278/78
134.204.220.0/2351278/78
134.204.224.0/2351278/78
134.204.236.0/2351278/78
134.204.238.0/2351278/78
192.55.2.0/2351278/78
192.55.16.0/2351278/78
192.55.18.0/2351276/78

Routing health

How AS18723'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

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%22

Propagation

  • Globally propagated90% of full-feed peers or more100.0%22
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 22 prefixes

Recent changes

Announcements that started or stopped since 13th Oct 2026.

No announcement by AS18723 started or stopped in this period.

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