BGP map for 121.42.0.0/16

121.42.0.0/16 is announced by AS37963 Hangzhou Alibaba Advertising Co.,Ltd. and seen by 333 peers of 23 RIPE RIS collectors, over 252 different AS paths. Its busiest upstreams are AS4837 CHINA UNICOM China169 Backbone (80%) and AS4811 China Telecom (Group) (20%). The most common path, used by 10 peers, is AS24482 AS2914 AS4134 AS4811 AS37963.

Routes checked 11:46:21 UTC

No change in the origin, the upstreams or the number of peers since 11:46 UTC, when this site first looked at 121.42.0.0/16.

AS-path graph toward 121.42.0.0/16

origin Tier 1Tier 2transitedge network prefix best path: chosen by 10 of 333 peers (3%) number on a line = peers using that link RIS data up to 11:45 UTC what the colours mean 12 of 252 paths drawn 6 quieter networks left out

Download PNG View JSON Raw upstream

333collector peers

23RIS collectors

252distinct AS paths

4.2average AS hops, 2 to 6

Upstreams

Networks directly in front of the origin.

Network	Peers	Share
AS4837 CHINA UNICOM China169 Backbone	268	80%
AS4811 China Telecom (Group)	65	20%

Transit networks

Networks between the collector peer and the origin.

Network	Peers	Share
AS4837 CHINA UNICOM China169 Backbone	267	80%
AS1299 TWELVE99 Arelion Sweden AB	70	21%
AS4811 China Telecom (Group)	65	20%
AS4134 No.31,Jin-rong Street	64	19%
AS174 Cogent Communications, LLC	41	12%
AS2914 NTT America, Inc.	21	6%
AS5511 Opentransit Orange S.A.	20	6%
AS6939 Hurricane Electric LLC	17	5%
AS6453 TATA COMMUNICATIONS (AMERICA) INC	15	5%
AS6762 SEABONE-NET TELECOM ITALIA SPARKLE S.p.A.	12	4%

AS paths

Every distinct path the collector peers use, most common first. An ASN repeated to lengthen a path (a prepend) is shown once.

#	Path, collector peer to origin	Peers	Share	Collectors
1	AS24482 AS2914 AS4134 AS4811 AS37963	10	3%	10
2	AS8218 AS4134 AS4811 AS37963	7	2%	6
3	AS6461 AS4837 AS37963	5	2%	5
4	AS12779 AS4837 AS37963	4	1%	4
5	AS13030 AS1299 AS4837 AS37963	4	1%	4
6	AS9002 AS5511 AS4837 AS37963	4	1%	4
7	AS14840 AS701 AS4837 AS37963	4	1%	2
8	AS199524 AS1299 AS4837 AS37963	4	1%	4
9	AS47147 AS1299 AS4837 AS37963	4	1%	4
10	AS2914 AS4134 AS4811 AS37963	3	<1%	3
11	AS3491 AS174 AS4837 AS37963	3	<1%	3
12	AS48185 AS1299 AS4837 AS37963	3	<1%	3
13	AS34927 AS1299 AS4837 AS37963	3	<1%	3
14	AS51185 AS6762 AS4837 AS37963	3	<1%	3
15	AS35280 AS6453 AS4837 AS37963	3	<1%	3
16	AS25091 AS4134 AS4811 AS37963	3	<1%	3
17	AS48362 AS1299 AS4837 AS37963	3	<1%	3
18	AS199524 AS174 AS4837 AS37963	3	<1%	3
19	AS6830 AS4837 AS37963	2	<1%	2
20	AS1299 AS4837 AS37963	2	<1%	2
21	AS6762 AS4837 AS37963	2	<1%	2
22	AS51184 AS4837 AS37963	2	<1%	2
23	AS3257 AS4134 AS4811 AS37963	2	<1%	2
24	AS62167 AS174 AS4837 AS37963	2	<1%	2
25	AS25160 AS174 AS4837 AS37963	2	<1%	2
26	AS42473 AS1299 AS4837 AS37963	2	<1%	2
27	AS14907 AS1299 AS4837 AS37963	2	<1%	2
28	AS49544 AS3356 AS4837 AS37963	2	<1%	1
29	AS31027 AS1299 AS4837 AS37963	2	<1%	1
30	AS49544 AS2914 AS4837 AS37963	2	<1%	2
31	AS34019 AS4134 AS4811 AS37963	2	<1%	2
32	AS15547 AS174 AS4837 AS37963	2	<1%	2
33	AS47692 AS4134 AS4811 AS37963	2	<1%	2
34	AS49544 AS1299 AS4837 AS37963	2	<1%	2
35	AS59890 AS6939 AS4837 AS37963	2	<1%	2
36	AS271253 AS3356 AS4837 AS37963	2	<1%	1
37	AS199524 AS6762 AS4837 AS37963	2	<1%	2
38	AS917 AS60068 AS4134 AS4811 AS37963	2	<1%	2
39	AS55720 AS23764 AS4134 AS4811 AS37963	2	<1%	1
40	AS58057 AS34549 AS5511 AS4837 AS37963	2	<1%	2
41	AS35710 AS3320 AS5511 AS4837 AS37963	2	<1%	2
42	AS3214 AS4809 AS4134 AS4811 AS37963	2	<1%	2
43	AS20612 AS8758 AS3303 AS4837 AS37963	2	<1%	1
44	AS142289 AS9583 AS4755 AS6453 AS4837 AS37963	2	<1%	1
45	AS4837 AS37963	1	<1%	1
46	AS5511 AS4837 AS37963	1	<1%	1
47	AS4134 AS4811 AS37963	1	<1%	1
48	AS680 AS4837 AS37963	1	<1%	1
49	AS58299 AS4837 AS37963	1	<1%	1
50	AS12956 AS4837 AS37963	1	<1%	1

50 of 252 paths shown. All of them are in the JSON.

More prefixes from AS37963

Routes seen by RIPE RIS in the 24 hours up to 16 Sep 2026, 11:45 UTC, fetched just now.