subnet.im

AS4837China Unicom Backbone

ChinaRegistryAPNICTypeCarrier

As of 10th November 2026, AS4837 (China Unicom Backbone), a transit carrier registered in China with APNIC, originates 1,526 IPv4 prefixes covering 59.3M addresses and 652 IPv6 prefixes. By IPv4 address space that makes it the 9th-largest of the 80,723 networks we see originating IPv4, and the 2nd-largest of 617 in China. It is seen behind 34 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS3356 (Lumen (Level 3)), and in front of 96 downstream networks. 98% of its announcements have a valid RPKI ROA; 5 are RPKI-invalid. 98% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

1,526

IPv6 prefixes

652

IPv4 addresses

59.3M

IPv6 /64s

1.7T

Upstream graph

The networks AS4837 is seen behind, one and two hops out, drawn from real AS paths.

AS4837Toward the internet core
Upstream graph for AS4837: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS4837China Unicom Back…This networkAS1299Arelion (fka. Tel…AS2497Internet Initiati…AS2914NTT America, Inc.AS3356Lumen (Level 3)AS6453TATA Communicatio…AS13030Init7 (Switzerlan…AS16552Tiggee LLCAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS3549Lumen (fka. Globa…AS8220COLTAS35280F5 Networks SARL

Networks observed one and two hops upstream of AS4837 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

313

adjacent networks

Upstreams
3411%
Peers
18358%
Downstreams
9631%

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

Upstreams of AS4837
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer228,06260
AS3356Lumen (Level 3)USPeer87,04463
AS6453TATA Communications (America) IncUSPeer74,45532
AS2497Internet Initiative Japan Inc.JPPeer74,1406
AS2914NTT America, Inc.USPeer73,60325
AS174Cogent Communications, LLCUSPeer63,69972
AS701Verizon BusinessUSPeer55,29792
AS6939Hurricane Electric LLCUSPeer54,45519
AS6762Telecom Italia Sparkle (Seabone)ITPeer51,47821
AS3320Deutsche Telekom AGDEPeer39,40536

Prefixes

All 2,178

The largest blocks AS4837 originates, widest first.

Largest prefixes originated by AS4837
PrefixAddressesVisibility
27.192.0.0/112.1M75/76
39.64.0.0/112.1M75/76
112.224.0.0/112.1M75/76
42.224.0.0/121M75/76
101.16.0.0/121M74/76
110.240.0.0/121M74/76
113.224.0.0/121M74/76
115.48.0.0/121M75/76
119.176.0.0/121M75/76
120.0.0.0/121M74/76

Routing health

How AS4837'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

  • Valid97.8%2,129
  • Invalid0.2%5
  • No ROA2.0%44

Propagation

  • Globally propagated90% of full-feed peers or more98.3%2,141
  • Partially propagated40% to 90%<0.1%1
  • Seen by few peersUnder 40%1.7%36

Prefix sizes

IPv4 — 1,526 prefixes

IPv6 — 652 prefixes

  • /3017.2B × /640.8%5
  • /324.3B × /6457.5%375
  • /332.1B × /640.6%4
  • /341.1B × /640.5%3
  • /35537M × /640.6%4
  • /36268M × /647.1%46
  • /4016.8M × /641.8%12
  • /418.4M × /640.3%2
  • /424.2M × /640.2%1
  • /441M × /640.6%4
  • /47131k × /640.6%4
  • /4865.5k × /6429.4%192

Recent changes

Announcements that started or stopped since 11th Oct 2026.

26 announced and 16 withdrawn in all; the most recent are shown.

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