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AS4837China Unicom Backbone

ChinaRegistryAPNICTypeCarrier

As of 26th September 2026, AS4837 (China Unicom Backbone), a transit carrier registered in China with APNIC, originates 1,517 IPv4 prefixes covering 59.5M addresses and 652 IPv6 prefixes. By IPv4 address space that makes it the 9th-largest of the 79,480 networks we see originating IPv4, and the 2nd-largest of 607 in China. It is seen behind 36 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS174 (Cogent Communications, LLC), and in front of 93 downstream networks. 97% of its announcements have a valid RPKI ROA; 8 are RPKI-invalid. 98% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

1,517

IPv6 prefixes

652

IPv4 addresses

59.5M

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 networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS2497Internet Initiati…AS2914NTT America, Inc.AS6453TATA Communicatio…AS151326DCConnect Communi…AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS3130RGnet OUAS49544i3D.net B.VAS8220COLTAS35280F5 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

308

adjacent networks

Upstreams
3612%
Peers
17958%
Downstreams
9330%

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

Upstreams of AS4837
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer220,47158
AS174Cogent Communications, LLCUSPeer94,86480
AS6453TATA Communications (America) IncUSPeer87,57730
AS2914NTT America, Inc.USPeer83,64523
AS2497Internet Initiative Japan Inc.JPPeer73,8626
AS3356Lumen (Level 3)USPeer72,15663
AS701Verizon BusinessUSPeer64,829101
AS6939Hurricane Electric LLCUSPeer60,14321
AS6762Telecom Italia Sparkle (Seabone)ITPeer43,03822
AS3320Deutsche Telekom AGDEPeer41,65136

Prefixes

All 2,169

The largest blocks AS4837 originates, widest first.

Largest prefixes originated by AS4837
PrefixAddressesVisibility
27.192.0.0/112.1M79/81
39.64.0.0/112.1M80/81
112.224.0.0/112.1M79/81
42.224.0.0/121M79/81
101.16.0.0/121M79/81
110.240.0.0/121M78/81
113.224.0.0/121M79/81
115.48.0.0/121M78/81
119.176.0.0/121M80/81
120.0.0.0/121M79/81

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

  • Valid97.0%2,104
  • Invalid0.4%8
  • No ROA2.6%57

Propagation

  • Globally propagated90% of full-feed peers or more98.3%2,133
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%1.7%36

Prefix sizes

IPv4 — 1,517 prefixes

IPv6 — 652 prefixes

  • /3017.2B × /640.8%5
  • /324.3B × /6457.7%376
  • /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 × /6429.3%191

Recent changes

Announcements that started or stopped since 27th Aug 2026.

253 announced and 11 withdrawn in all; the most recent are shown.

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