$ query “AS4” --type=asn → 1 result(s)
AS4 — ISI-AS
University of Southern California
AS4 is a mid-size transit provider registered to University of Southern California, registered in the United States since 1984. The network announces a respectable 66 816 IPv4 addresses. Supports IPv6.
- Pioneer — Registered before the year 2000
Basic Information
- Country
- 🇺🇸 United States
- Category
- Education/Research
- Network Role
- Mid-size Transit
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Registered
- February 22, 1984
- Last Changed
- March 04, 2026
- Last Seen
- March 05, 2026
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 47 / 18
- IPv6 Prefixes (raw / aggregated)
- 7 / 5
- IPv4 Addresses
- 66 816
- Largest IPv4 Prefix
- /17 (32 768 addresses)
- Largest IPv6 Prefix
- /32
- Geolocated Countries
- 🇺🇸 US (14 IPs), 🇮🇳 IN (2 IPs), 🇨🇦 CA (1 IPs), 🇦🇺 AU
- Prefix Changed
- March 04, 2026
Reputation
- Reputation
- Pristine — 0 flagged IPs out of 66 816 total (0.00%)
Connectivity Summary
- Upstream Providers
- 6 upstream autonomous systems providing transit
- Peers
- 4 autonomous systems exchanging traffic without transit fees
- Downstream Customers
- 12 downstream autonomous systems buying transit
- Degree
- 22 unique BGP neighbors (providers + customers + peers)
- Reach
- 15 — customer cone size measuring network influence
- Degree Rank
- #7 053
- Reach Rank
- #2 585
Upstream Providers (6)
Prefix Lists
IPv4 Prefixes (47 total)
- 128.9.128.0/17 (32 768 addresses)
- 128.9.64.0/18 (16 384 addresses)
- 128.9.32.0/19 (8 192 addresses)
- 128.9.0.0/20 (4 096 addresses)
- 128.9.16.0/22 (1 024 addresses)
- 128.9.28.0/22 (1 024 addresses)
- 165.140.12.0/23 (512 addresses)
- 43.240.64.0/24 (256 addresses)
- 104.156.142.0/24 (256 addresses)
- 128.9.26.0/24 (256 addresses)
- 160.30.34.0/24 (256 addresses)
- 165.140.14.0/24 (256 addresses)
- 170.205.17.0/24 (256 addresses)
- 198.32.16.0/24 (256 addresses)
- 206.117.6.0/24 (256 addresses)
- 206.117.27.0/24 (256 addresses)
- 206.117.31.0/24 (256 addresses)
- 206.117.37.0/24 (256 addresses)
IPv6 Prefixes (7 total)
- 2606:d5c0::/32
- 2001:1878:402::/47
- 2001:500:202::/48
- 2001:1878:401::/48
- 2001:1878:404::/48