AS401999 Fairfax County NCR 🇺🇸 US
Announcing 4 prefixes, seen at the RIS collectors.
IPv4 prefixes
4
1,024 (4 × /24)
IPv6 prefixes
0
-
Upstreams
3
transit providers observed
Peers
0
settlement-free adjacencies
Downstreams
0
transit customers observed
Customer cone
0
ASes reachable through it
Registry and operator data
- AS number
- AS401999
- Name
- Fairfax County NCR
- Organisation
- Fairfax County NCR
- Country
- 🇺🇸 US
- RIR
- ARIN
- Allocated
- 2025-09-19
RPKI coverage of this AS
Its own announcements, validated against the current ROA set
Announcement history
One point per day, recorded at each table import
IPv4
IPv6
Recorded changes
New prefixes and origin changes seen on the live stream
| When | Change | Prefix | Origin | Path |
|---|---|---|---|---|
| 2026-11-06 21:18:01Z | origin change | 76.9.155.0/24 | AS203 → AS401999 | 3288403277271743356401999 |
| 2026-11-06 21:18:01Z | origin change | 76.9.156.0/24 | AS203 → AS401999 | 3288403277271743356401999 |
| 2026-11-06 21:17:48Z | origin change | 76.9.155.0/24 | AS401999 → AS203 | 35493356203 |
| 2026-11-06 21:17:48Z | origin change | 76.9.156.0/24 | AS401999 → AS203 | 35493356203 |
| 2026-11-06 21:17:19Z | origin change | 76.9.155.0/24 | AS203 → AS401999 | 70183356401999 |
| 2026-11-06 21:17:19Z | origin change | 76.9.156.0/24 | AS203 → AS401999 | 70183356401999 |
| 2026-11-06 21:17:15Z | origin change | 76.9.155.0/24 | AS401999 → AS203 | 1328251743356203 |
| 2026-11-06 21:17:15Z | origin change | 76.9.156.0/24 | AS401999 → AS203 | 1328251743356203 |
| 2026-11-06 21:17:14Z | origin change | 76.9.155.0/24 | AS203 → AS401999 | 5572029146461401999 |
| 2026-11-06 21:17:14Z | origin change | 76.9.156.0/24 | AS203 → AS401999 | 5572029146461401999 |
| 2026-11-06 21:12:38Z | origin change | 76.9.155.0/24 | AS401999 → AS203 | 1328253356203 |
| 2026-11-06 21:12:38Z | origin change | 76.9.156.0/24 | AS401999 → AS203 | 1328253356203 |
| 2026-11-06 21:12:25Z | origin change | 76.9.155.0/24 | AS203 → AS401999 | 216285828067626939401999 |
| 2026-11-06 21:12:25Z | origin change | 76.9.156.0/24 | AS203 → AS401999 | 216285828067626939401999 |
| 2026-11-06 21:12:17Z | origin change | 76.9.155.0/24 | AS401999 → AS203 | 70183356203 |
| 2026-11-06 21:12:17Z | origin change | 76.9.156.0/24 | AS401999 → AS203 | 70183356203 |