BGP map for 128.9.48.0/20

128.9.48.0/20 is announced by AS4 University of Southern California and seen by 331 peers of 23 RIPE RIS collectors, over 251 different AS paths. All of those routes reach it through one upstream, AS10886 University of Maryland. The most common path, used by 11 peers, is AS24482 AS6461 AS10886 AS4.

Routes checked 03:22:45 UTC

No change in the origin, the upstreams or the number of peers since 03:22 UTC, when this site first looked at 128.9.48.0/20.

AS-path graph toward 128.9.48.0/20

origin Tier 1Tier 2transitedge network prefix best path: chosen by 11 of 331 peers (3%) number on a line = peers using that link RIS data up to 03:21 UTC what the colours mean 12 of 251 paths drawn 6 quieter networks left out

Download PNG View JSON Raw upstream

331collector peers

23RIS collectors

251distinct AS paths

4.4average AS hops, 3 to 7

Upstreams

Networks directly in front of the origin.

Network	Peers	Share
AS10886 University of Maryland	331	100%

Transit networks

Networks between the collector peer and the origin.

Network	Peers	Share
AS10886 University of Maryland	331	100%
AS1299 TWELVE99 Arelion Sweden AB	100	30%
AS6461 Zayo Bandwidth	95	29%
AS3356 Level 3 Parent, LLC	70	21%
AS174 Cogent Communications, LLC	36	11%
AS3257 GTT-BACKBONE GTT Communications Inc.	14	4%
AS2914 NTT America, Inc.	8	2%
AS11537 Internet2	6	2%
AS6762 SEABONE-NET TELECOM ITALIA SPARKLE S.p.A.	6	2%
AS34549 MEER-AS meerfarbig GmbH & Co. KG	4	1%

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 AS6461 AS10886 AS4	11	3%	11
2	AS199524 AS1299 AS10886 AS4	8	2%	8
3	AS8218 AS6461 AS10886 AS4	7	2%	6
4	AS6461 AS10886 AS4	5	2%	5
5	AS13030 AS6461 AS10886 AS4	4	1%	4
6	AS12779 AS6461 AS10886 AS4	4	1%	4
7	AS14840 AS3356 AS10886 AS4	4	1%	2
8	AS47147 AS1299 AS10886 AS4	4	1%	4
9	AS2914 AS3356 AS10886 AS4	3	<1%	3
10	AS48185 AS6461 AS10886 AS4	3	<1%	3
11	AS34927 AS1299 AS10886 AS4	3	<1%	3
12	AS3214 AS6461 AS10886 AS4	3	<1%	3
13	AS49544 AS3356 AS10886 AS4	3	<1%	2
14	AS9002 AS3257 AS10886 AS4	3	<1%	3
15	AS35280 AS3356 AS10886 AS4	3	<1%	3
16	AS34019 AS6461 AS10886 AS4	3	<1%	3
17	AS25091 AS6461 AS10886 AS4	3	<1%	3
18	AS48362 AS1299 AS10886 AS4	3	<1%	3
19	AS1299 AS10886 AS4	2	<1%	2
20	AS6830 AS1299 AS10886 AS4	2	<1%	2
21	AS3320 AS6461 AS10886 AS4	2	<1%	2
22	AS62167 AS3356 AS10886 AS4	2	<1%	2
23	AS25160 AS1299 AS10886 AS4	2	<1%	2
24	AS42473 AS1299 AS10886 AS4	2	<1%	2
25	AS8529 AS3356 AS10886 AS4	2	<1%	2
26	AS14907 AS1299 AS10886 AS4	2	<1%	2
27	AS15547 AS174 AS10886 AS4	2	<1%	2
28	AS6762 AS1299 AS10886 AS4	2	<1%	2
29	AS49544 AS1299 AS10886 AS4	2	<1%	2
30	AS59890 AS3356 AS10886 AS4	2	<1%	2
31	AS271253 AS3356 AS10886 AS4	2	<1%	1
32	AS19151 AS174 AS10886 AS4	2	<1%	2
33	AS58057 AS34549 AS6461 AS10886 AS4	2	<1%	2
34	AS31027 AS12552 AS6461 AS10886 AS4	2	<1%	1
35	AS35710 AS3320 AS1299 AS10886 AS4	2	<1%	2
36	AS51184 AS1764 AS3356 AS10886 AS4	2	<1%	2
37	AS47692 AS2914 AS3356 AS10886 AS4	2	<1%	2
38	AS20612 AS9044 AS174 AS10886 AS4	2	<1%	1
39	AS142289 AS9583 AS4755 AS6453 AS174 AS10886 AS4	2	<1%	1
40	AS3257 AS10886 AS4	1	<1%	1
41	AS36924 AS1299 AS10886 AS4	1	<1%	1
42	AS6894 AS174 AS10886 AS4	1	<1%	1
43	AS31742 AS1299 AS10886 AS4	1	<1%	1
44	AS35266 AS1299 AS10886 AS4	1	<1%	1
45	AS286 AS3257 AS10886 AS4	1	<1%	1
46	AS1828 AS6461 AS10886 AS4	1	<1%	1
47	AS3491 AS6461 AS10886 AS4	1	<1%	1
48	AS9002 AS6461 AS10886 AS4	1	<1%	1
49	AS6424 AS1299 AS10886 AS4	1	<1%	1
50	AS39122 AS1299 AS10886 AS4	1	<1%	1

50 of 251 paths shown. All of them are in the JSON.

More prefixes from AS4

Routes seen by RIPE RIS in the 24 hours up to 16 Sep 2026, 03:21 UTC, fetched just now.