AS21821
Montefiore Medical Center
AS21821 is Montefiore Medical Center (montefiore.org). It announces 1,024 IPv4 addresses in 4 prefixes, and 0 IPv6 prefixes.
United States· ARIN· allocated 2017-04-03· business
1,024
IPv4 addresses announced
4
IPv4 prefixes
0
IPv6 prefixes
50.00%
of its routes RPKI-valid
1,024
of its IPv4 geolocated
1
country
Where its space is
The IPv4 it announces that IP Geolocation places, by country. A /24 counts for the AS announcing most of it.
- United States1,024 · 100.00%
Registry record
Its ASN Whois record, as the registry publishes it.
- handle
- MMAHS-01
- name
- Montefiore Medical Center
- org
- MMC-125
- org name
- Montefiore Medical Center
- org address
- 1 Fordham Plaza, Bronx, NY, 10458
- org city
- Bronx
- org country
- US
- country
- US
- source
- arin
- created
- 2017-04-03
- updated
- 2017-04-03
- abuse name
- NCC
- abuse email
- ncc@montefiore.org
- abuse phone
- +1-914-457-6700
- abuse kind
- role
- abuse city
- Yonkers
- abuse country
- US
- admin name
- Manny Gonzalez
- admin email
- mangonzale@montefiore.org
- admin phone
- +1-646-996-1466
- admin kind
- person
- admin city
- Yonkers
- admin country
- US
- tech name
- NCC
- tech email
- ncc@montefiore.org
- tech phone
- +1-914-457-6700
- tech kind
- role
- tech city
- Yonkers
- tech country
- US
- abuse unvalidated since
- 2025-04-01
What the databases see
Addresses each address-keyed database holds in the IPv4 it announces, as a share of that space, with its largest providers. Counts overlap.
- 0.49%
- anyip, floppydata0.20%
- None here
- None here
- None here
- None here
- None here
- None here
- None here
- None here
- 0.20%
- None here
- 1.37%
IPv4 prefixes
Every IPv4 prefix BGP Route saw it announce. A prefix another AS also announces says so.
| PREFIX | COUNTRY | RPKI | PEERS | FIRST SEEN |
|---|---|---|---|---|
| 144.121.102.0/24 | United States | not found | 16 | 2026-10-02 |
| 144.121.104.0/24 | United States | not found | 16 | 2026-10-02 |
| 216.255.100.0/24 | United States | valid | 16 | 2026-10-02 |
| 216.255.101.0/24 | United States | valid | 16 | 2026-10-02 |
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