158.20.136.0/22
Currently announced by AS1540 Headquarters, USAISC, in the routed prefix 158.20.128.0/17.
- Current ASN
- AS1540
- Headquarters, USAISC
- Routed prefix
- 158.20.128.0/17
- Most specific route covering this prefix
- ASNs over time
- 2
- 3 announcement records
- RIR allocation
- ARIN
- United States · 158.20.0.0/16
Routing data · Nov 8, 2026, 10:26 UTC
ASN historyEvery routed prefix covering 158.20.136.0/22
| Prefix | ASN | Name | Registered country | First seen (UTC) | Last seen (UTC) | Status |
|---|---|---|---|---|---|---|
| 158.20.136.0/22 | AS1540 | Headquarters, USAISC |  United States | 2026-11-04 02:23 | 2026-11-04 04:22 | Stopped |
| 158.20.128.0/17 | AS1540 | Headquarters, USAISC | United States | 2026-11-04 02:23 | 2026-11-08 10:26 | Announcing |
| 158.20.128.0/17 | AS367 | United States Department of Defense (DoD) | United States | Before monitoring | 2026-11-04 00:23 | Stopped |
More specific routes0 total
No more specific routes inside this prefix.
Change logAll changes
| Detected (UTC) | Prefix | Change | ASN | Name | Previous ASN | Country |
|---|---|---|---|---|---|---|
| 2026-11-04 06:24 | 158.20.136.0/22 | Withdrawal | AS1540 | Headquarters, USAISC | — | United States |
| 2026-11-04 02:23 | 158.20.136.0/22 | New announcementNo longer announced | AS1540 | Headquarters, USAISC | — | United States |
| 2026-11-04 02:23 | 158.20.128.0/17 | Origin change | AS1540 | Headquarters, USAISC | AS367 | United States |