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AS21859Zenlayer Inc

United StatesRegistryARINTypeEyeball

As of 26th September 2026, AS21859 (Zenlayer Inc), an access network registered in the United States with ARIN, originates 1,716 IPv4 prefixes covering 958k addresses and 161 IPv6 prefixes. By IPv4 address space that makes it the 477th-largest of the 79,480 networks we see originating IPv4, and the 111th-largest of 18,421 in the United States. It is seen behind 141 upstream networks, most often AS4229 (Zenlayer Inc) and AS2914 (NTT America, Inc.), and in front of 226 downstream networks. 67% of its announcements have a valid RPKI ROA; 48 are RPKI-invalid. 95% of its routes reach at least 90% of full-feed peers, and 84 prefixes are also originated by another network.

At a glance

IPv4 prefixes

1,716

IPv6 prefixes

161

IPv4 addresses

958k

IPv6 /64s

90.4B

Upstream graph

The networks AS21859 is seen behind, one and two hops out, drawn from real AS paths.

AS21859Toward the internet core
Upstream graph for AS21859: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS21859Zenlayer IncThis networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS3257GTT Communication…AS4229Zenlayer IncAS151326DCConnect Communi…AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS3130RGnet OUAS49544i3D.net B.VAS398465Rackdog LLCAS6453TATA Communicatio…

Networks observed one and two hops upstream of AS21859 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

1,066

adjacent networks

Upstreams
14113%
Peers
69966%
Downstreams
22621%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 141.

Upstreams of AS21859
NetworkCountryRelationshipPathsVantage pts
AS4229Zenlayer IncUSPeer203,274145
AS2914NTT America, Inc.USPeer26,575145
AS1299Arelion (fka. Telia Carrier)SEPeer25,104139
AS174Cogent Communications, LLCUSPeer12,110138
AS3257GTT Communications Inc.USPeer9,906145
AS132337AxclusiveSGPeer9,2972
AS6939Hurricane Electric LLCUSPeer9,11732
AS3356Lumen (Level 3)USPeer8,445138
AS38082True International Gateway Co., Ltd.THPeer6,916121
AS7195EdgeUnoCOPeer6,892103

Prefixes

All 1,877

The largest blocks AS21859 originates, widest first.

Largest prefixes originated by AS21859
PrefixAddressesVisibility
128.1.0.0/1665.5k81/81
128.14.0.0/1665.5k81/81
128.14.0.0/1732.8k81/81
129.227.128.0/1732.8k81/81
107.151.128.0/1816.4k81/81
107.155.0.0/1816.4k81/81
23.248.160.0/198.2k81/81
23.251.96.0/198.2k81/81
128.14.128.0/198.2k81/81
129.227.64.0/198.2k81/81

Routing health

How AS21859'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

  • Valid67.3%1,263
  • Invalid2.6%48
  • No ROA30.2%566

Propagation

  • Globally propagated90% of full-feed peers or more94.5%1,774
  • Partially propagated40% to 90%1.1%20
  • Seen by few peersUnder 40%4.4%83

Prefix sizes

IPv4 — 1,716 prefixes

IPv6 — 161 prefixes

  • /2934.4B × /641.2%2
  • /324.3B × /641.9%3
  • /36268M × /6419.9%32
  • /3867.1M × /641.9%3
  • /46262k × /640.6%1
  • /47131k × /640.6%1
  • /4865.5k × /6473.9%119

Recent changes

Announcements that started or stopped since 27th Aug 2026.

44 announced and 28 withdrawn in all; the most recent are shown.

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