$ query “AS21859” --type=asn → 1 result(s)

AS21859 · ZEN-ECN

Zenlayer Inc

AS21859 is operated by Zenlayer Inc and serves as a major transit provider, based in the United States since 2013. The system announces a solid 729 088 IPv4 addresses, including a /16, and supports IPv6. Most of its address space is geolocated to the United States, with additional presence in Hong Kong SAR China and Singapore, and smaller footprints in 35 additional countries. This AS's prefix announcements have been recently modified.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇺🇸 United States
Category
Hosting
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
April 02, 2013
Last Changed
March 04, 2026
Last Seen
October 21, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
1 737 / 617
IPv6 Prefixes (raw / aggregated)
169 / 103
IPv4 Addresses
729 088
Largest IPv4 Prefix
/16 (65 536 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇺🇸 United States (362 176 IPs), 🇭🇰 Hong Kong SAR China (76 016 IPs), 🇸🇬 Singapore (71 712 IPs) and 35 more
Prefix Changed
October 22, 2026

Reputation

Reputation
Good — 330 flagged IPs out of 729 088 total (0.05%)
Open Proxies
2 known open proxies in this network

Connectivity Summary

Upstream Providers
57 upstreams providing transit
Peers
846 networks exchanging traffic without transit
Downstream Customers
221 downstreams buying transit
Unclassified
23 unclassified BGP neighbors
Degree
1 147 unique BGP neighbors
Reach
477 networks in customer cone

Upstream Providers (57)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS174 — COGENT-174 (Tier-1 transit)
  • AS7195 — EDGEUNO
  • AS6461 — ZAYO-6461 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS13335 — CLOUDFLARENET
  • AS20764 — RASCOM-AS
  • AS3216 — SOVAM-AS
  • AS3257 — GTT-BACKBONE (Tier-1 transit)
  • AS30844 — LIQUID-AS
  • and 47 more

Prefix Lists

IPv4 Prefixes (1 737 total)

  • 128.1.0.0/16 (65 536 addresses (/16 prefix))
  • 128.14.0.0/16 (65 536 addresses (/16 prefix))
  • 129.227.128.0/17 (32 768 addresses (/17 prefix))
  • 23.90.128.0/18 (16 384 addresses (/18 prefix))
  • 107.151.128.0/18 (16 384 addresses (/18 prefix))
  • 107.155.0.0/18 (16 384 addresses (/18 prefix))
  • 129.227.0.0/18 (16 384 addresses (/18 prefix))
  • 156.59.0.0/18 (16 384 addresses (/18 prefix))
  • 156.59.128.0/18 (16 384 addresses (/18 prefix))
  • 23.248.160.0/19 (8 192 addresses (/19 prefix))
  • 23.251.96.0/19 (8 192 addresses (/19 prefix))
  • 98.96.192.0/19 (8 192 addresses (/19 prefix))
  • 98.98.32.0/19 (8 192 addresses (/19 prefix))
  • 98.98.64.0/19 (8 192 addresses (/19 prefix))
  • 98.98.128.0/19 (8 192 addresses (/19 prefix))
  • 98.98.192.0/19 (8 192 addresses (/19 prefix))
  • 104.166.128.0/19 (8 192 addresses (/19 prefix))
  • 107.148.160.0/19 (8 192 addresses (/19 prefix))
  • 129.227.64.0/19 (8 192 addresses (/19 prefix))
  • 156.59.224.0/19 (8 192 addresses (/19 prefix))
  • 162.128.160.0/19 (8 192 addresses (/19 prefix))
  • 162.128.192.0/19 (8 192 addresses (/19 prefix))
  • 169.197.96.0/19 (8 192 addresses (/19 prefix))
  • 192.169.96.0/19 (8 192 addresses (/19 prefix))
  • 193.118.32.0/19 (8 192 addresses (/19 prefix))
  • 193.118.96.0/19 (8 192 addresses (/19 prefix))
  • 23.236.112.0/20 (4 096 addresses (/20 prefix))
  • 38.33.144.0/20 (4 096 addresses (/20 prefix))
  • 38.183.160.0/20 (4 096 addresses (/20 prefix))
  • 65.255.32.0/20 (4 096 addresses (/20 prefix))
  • 69.28.48.0/20 (4 096 addresses (/20 prefix))
  • 98.98.112.0/20 (4 096 addresses (/20 prefix))
  • 104.166.160.0/20 (4 096 addresses (/20 prefix))
  • 129.227.112.0/20 (4 096 addresses (/20 prefix))
  • 152.175.144.0/20 (4 096 addresses (/20 prefix))
  • 162.128.48.0/20 (4 096 addresses (/20 prefix))
  • 192.254.80.0/20 (4 096 addresses (/20 prefix))
  • 209.177.80.0/20 (4 096 addresses (/20 prefix))
  • 23.236.96.0/21 (2 048 addresses (/21 prefix))
  • 45.40.48.0/21 (2 048 addresses (/21 prefix))
  • 45.43.40.0/21 (2 048 addresses (/21 prefix))
  • 98.96.224.0/21 (2 048 addresses (/21 prefix))
  • 98.96.240.0/21 (2 048 addresses (/21 prefix))
  • 98.98.0.0/21 (2 048 addresses (/21 prefix))
  • 98.98.24.0/21 (2 048 addresses (/21 prefix))
  • 98.98.168.0/21 (2 048 addresses (/21 prefix))
  • 98.98.248.0/21 (2 048 addresses (/21 prefix))
  • 104.166.184.0/21 (2 048 addresses (/21 prefix))
  • 104.218.160.0/21 (2 048 addresses (/21 prefix))
  • 114.114.112.0/21 (2 048 addresses (/21 prefix))

IPv6 Prefixes (169 total)

  • 2a05:2ac0::/29
  • 2a07:fc40::/29
  • 2a09:40::/29
  • 2a0c:2cc0::/29
  • 2a0c:43c0::/29
  • 2a0c:4e00::/29
  • 2a0c:6a80::/29
  • 2a0f:3940::/29
  • 2a10:8740::/29
  • 2a10:e180::/29
  • 2a12:f440::/29
  • 2607:a400::/32
  • 2a0b:21c0:8000::/33
  • 2604:980:8000::/34
  • 2a0b:21c0:4000::/34
  • 2404:ff40:2000::/35
  • 2604:980:2000::/35
  • 2604:980:4000::/35
  • 2a0b:21c0:2000::/35
  • 2404:ff40::/36
  • 2404:ff40:7000::/36
  • 2604:980:1000::/36
  • 2604:980:7000::/36
  • 2604:980:d000::/36
  • 2a0b:21c0:1000::/36
  • 2a0b:21c1:1000::/36
  • 2a0b:21c1:3000::/36
  • 2a0b:21c1:5000::/36
  • 2602:ffe4::/37
  • 2602:ffe4:800::/38
  • 2602:ffe4:c48::/45
  • 2604:980:e008::/45
  • 2403:8300:e08::/46
  • 2602:ffe4:c50::/46
  • 2604:980:e004::/46
  • 2403:8300:e04::/47
  • 2602:ffe4:c02::/47
  • 2602:ffe4:c06::/47
  • 2602:ffe4:c0a::/47
  • 2602:ffe4:c14::/47
  • 2602:ffe4:c18::/47
  • 2602:ffe4:c20::/47
  • 2602:ffe4:c26::/47
  • 2602:ffe4:c40::/47
  • 2602:ffe4:c44::/47
  • 2602:ffe4:c56::/47
  • 2602:ffe4:c64::/47
  • 2602:ffe4:c6c::/47
  • 2602:ffe4:c7a::/47
  • 2602:ffe4:c9c::/47