← Back to Search
General Information
Name:
National Institutes of Health
Domain:
nih.gov
Country:
US
Type:
government
Registry:
ARIN
Prefix Counts
IPv4 Count:
339,200
IPv6 Count:
20,282,757,774,287,719,437,149,566,664,704
IPv4 Prefixes
| CIDR | Country | Network Name | Organization | Registry | Status | Size |
|---|---|---|---|---|---|---|
| 128.231.0.0/16 | US | NIHNET-1 | National Institutes of Health | ARIN | allocation | 65,536 |
| 128.231.3.0/24 | US | NIHNET-1 | National Institutes of Health | ARIN | allocation | 256 |
| 128.231.245.0/24 | US | NIHNET-1 | National Institutes of Health | ARIN | allocation | 256 |
| 137.187.0.0/16 | US | NIHNET-2 | National Institutes of Health | ARIN | allocation | 65,536 |
| 156.40.0.0/16 | US | NIHNET-3 | National Institutes of Health | ARIN | allocation | 65,536 |
| 157.98.0.0/16 | US | NIEHS | National Institute of Environmental Health Sciences | ARIN | allocation | 65,536 |
| 162.99.224.0/19 | US | HRSA-NET | HRSA | ARIN | reassignment | 8,192 |
| 165.112.0.0/16 | US | NIHNET-4-B | National Institutes of Health | ARIN | allocation | 65,536 |
| 165.112.136.0/21 | US | NIHNET-4-B | National Institutes of Health | ARIN | allocation | 2,048 |
| 192.231.145.0/24 | US | NIHNET-4 | National Institutes of Health | ARIN | allocation | 256 |
| 192.231.146.0/24 | US | NIHNET-5 | National Institutes of Health | ARIN | allocation | 256 |
| 192.231.147.0/24 | US | NIHNET-6 | National Institutes of Health | ARIN | allocation | 256 |
IPv6 Prefixes
| CIDR | Country | Network Name | Organization | Registry | Status |
|---|---|---|---|---|---|
| 2601:9400::/24 | US | HHS-IPV6-NIH24-2022 | National Institutes of Health | ARIN | reallocation |
| 2607:f220:400::/40 | US | NIHNET-V6 | National Institutes of Health | ARIN | reallocation |
| 2607:f220:400::/43 | US | NIHNET-V6 | National Institutes of Health | ARIN | reallocation |
