Data as of Nov 3, 2026
Autonomous system
AS21821
Montefiore Medical Center
Announces 1,024 addresses in 4 prefixes. None of it is anonymizer space.
Type
Business
US
Proxy activity, 30 days
3 exits
Announced prefixes
| Prefix | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|
| 144.121.102.0/24 since May 2017 | Business | 1 | Zayo Bandwidth | |
| 144.121.104.0/24 since May 2017 | Business | Zayo Bandwidth | ||
| 216.255.100.0/24 since Oct 2006 | Business | Cablevision Systems Corp. | ||
| 216.255.101.0/24 since Oct 2006 | Business | 2 | Cablevision Systems Corp. |
Residential-proxy exposure
Spread
2
/24s with at least one exit
Providers
17
selling exits here
/24s with the most always-on exits
| /24 | Always-on exits | Proxy exits | |
|---|---|---|---|
| 216.255.101.0/24 | 0 | 2 | |
| 144.121.102.0/24 | 0 | 1 |
Proxy providers listing exits
- BottingTools
- Bright Data
- Byteful
- ColaProxy
- EnigmaProxy
- FastProxy
- Geonode
- InfiniteProxies
- LudaxProxy
- NovaProxy
- Novada
- PrivateProxy
- ProxyEmpire
- ProxyWing
- Thordata
- ThunderProxy
- VantageProxies
Proxy activity
Oct 4, 2026 – Nov 2, 2026
AS21821, day by day
84 observations
Network & history
Profile
- Registered
- Apr 3, 2017
- Domain
- montefiore.org
- Industry
- Chemical and Pharmaceutical Manufacturing
Routing patterns
How its announcements have moved
Arrivals