143.74.37.0/24
Currently announced by AS1540 Headquarters, USAISC, in the routed prefix 143.74.36.0/23.
- Current ASN
- AS1540
- Headquarters, USAISC
- Routed prefix
- 143.74.36.0/23
- Most specific route covering this prefix
- ASNs over time
- 2
- 3 announcement records
- RIR allocation
- ARIN
- United States · 143.74.0.0/16
Routing data · Nov 8, 2026, 10:26 UTC
ASN historyEvery routed prefix covering 143.74.37.0/24
| Prefix | ASN | Name | Registered country | First seen (UTC) | Last seen (UTC) | Status |
|---|---|---|---|---|---|---|
| 143.74.37.0/24 | AS1540 | Headquarters, USAISC |  United States | 2026-11-07 02:21 | 2026-11-07 04:26 | Stopped |
| 143.74.36.0/23 | AS1540 | Headquarters, USAISC | United States | Before monitoring | 2026-11-08 10:26 | Announcing |
| 143.74.0.0/16 | AS721 | United States Department of Defense (DoD) | United States | Before monitoring | 2026-11-08 10:26 | Announcing |
More specific routes0 total
No more specific routes inside this prefix.
Change logAll changes
| Detected (UTC) | Prefix | Change | ASN | Name | Previous ASN | Country |
|---|---|---|---|---|---|---|
| 2026-11-07 06:25 | 143.74.37.0/24 | Withdrawal | AS1540 | Headquarters, USAISC | — | United States |
| 2026-11-07 02:21 | 143.74.37.0/24 | New announcementNo longer announced | AS1540 | Headquarters, USAISC | — | United States |
| 2026-10-31 02:18 | 143.74.36.0/23 | WithdrawalAnnounced again | AS1540 | Headquarters, USAISC | — | United States |