AS21821 Montefiore Medical Center 🇺🇸 US
Announcing 4 prefixes, seen at the RIS collectors.
IPv4 prefixes
4
1,024 (4 × /24)
IPv6 prefixes
0
-
Upstreams
2
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
- AS21821
- Name
- Montefiore Medical Center
- Organisation
- Montefiore Medical Center
- Country
- 🇺🇸 US
- RIR
- ARIN
- Allocated
- 2017-04-03
RPKI coverage of this AS
Its own announcements, validated against the current ROA set
Announced prefixes
4 in total
| Prefix | RPKI | Peers | Sample path | First seen |
|---|---|---|---|---|
| 144.121.102.0/24 v4 | no ROA | 42 | 3278721821 | 2026-09-18 |
| 144.121.104.0/24 v4 | no ROA | 42 | 3278721821 | 2026-09-18 |
| 216.255.100.0/24 v4 | RPKI valid | 42 | 3278721821 | 2026-09-18 |
| 216.255.101.0/24 v4 | RPKI valid | 42 | 3278721821 | 2026-09-18 |