subnet.im

AS21859Zenlayer Inc

United StatesRegistryARINTypeEyeball

As of 12th November 2026, AS21859 (Zenlayer Inc), an access network registered in the United States with ARIN, originates 1,800 IPv4 prefixes covering 983k addresses and 167 IPv6 prefixes. By IPv4 address space that makes it the 473rd-largest of the 80,805 networks we see originating IPv4, and the 110th-largest of 18,769 in the United States. It is seen behind 143 upstream networks, most often AS4229 (Zenlayer Inc) and AS2914 (NTT America, Inc.), and in front of 248 downstream networks. 68% of its announcements have a valid RPKI ROA; 51 are RPKI-invalid. 93% of its routes reach at least 90% of full-feed peers, and 105 prefixes are also originated by another network.

At a glance

IPv4 prefixes

1,800

IPv6 prefixes

167

IPv4 addresses

983k

IPv6 /64s

395B

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 networkAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS3257GTT Communication…AS3356Lumen (Level 3)AS4229Zenlayer IncAS13030Init7 (Switzerlan…AS16552Tiggee LLCAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS6667Elisa OyjAS398465Rackdog 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

1,085

adjacent networks

Upstreams
14313%
Peers
69464%
Downstreams
24823%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 143.

Upstreams of AS21859
NetworkCountryRelationshipPathsVantage pts
AS4229Zenlayer IncUSPeer219,735142
AS2914NTT America, Inc.USPeer26,979141
AS1299Arelion (fka. Telia Carrier)SEPeer26,247138
AS3257GTT Communications Inc.USPeer13,084127
AS3356Lumen (Level 3)USPeer12,262130
AS174Cogent Communications, LLCUSPeer10,262134
AS20764CJSC RASCOMRUPeer8,299140
AS38082True International Gateway Co., Ltd.THPeer7,701120
AS4788TM Technology Services Sdn. Bhd.MYPeer6,288118
AS6939Hurricane Electric LLCUSPeer5,88827

Prefixes

All 1,967

The largest blocks AS21859 originates, widest first.

Largest prefixes originated by AS21859
PrefixAddressesVisibility
128.1.0.0/1665.5k78/78
128.14.0.0/1665.5k78/78
128.14.0.0/1732.8k78/78
129.227.128.0/1732.8k78/78
107.151.128.0/1816.4k78/78
107.155.0.0/1816.4k78/78
23.248.160.0/198.2k78/78
23.251.96.0/198.2k78/78
128.14.128.0/198.2k78/78
129.227.64.0/198.2k78/78

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

  • Valid68.4%1,346
  • Invalid2.6%51
  • No ROA29.0%570

Propagation

  • Globally propagated90% of full-feed peers or more93.3%1,835
  • Partially propagated40% to 90%1.9%37
  • Seen by few peersUnder 40%4.8%95

Prefix sizes

IPv4 — 1,800 prefixes

IPv6 — 167 prefixes

  • /2934.4B × /646.6%11
  • /324.3B × /641.2%2
  • /36268M × /6419.2%32
  • /3867.1M × /641.8%3
  • /46262k × /640.6%1
  • /47131k × /640.6%1
  • /4865.5k × /6470.1%117

Recent changes

Announcements that started or stopped since 13th Oct 2026.

71 announced and 36 withdrawn in all; the most recent are shown.

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