Data as of Nov 13, 2026
156.40.0.0/16
No anonymizer space · no proxy exits in 30 daysNational Institutes of Health
Announcements
More specific
Announcements inside
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 156.40.53.0/24 since Aug 2015 | AS30387 | Business | National Institutes of Health | |
| 156.40.93.0/24 since May 2015 | AS19050 | Business | U.S. Department of Health & Human Services | |
| 156.40.94.0/24 since Jul 2015 | AS19050 | Business | U.S. Department of Health & Human Services | |
| 156.40.95.0/24 since Jun 2017 | AS19050 | Business | U.S. Department of Health & Human Services | |
| 156.40.98.0/23 since May 2015 | AS30387 | Business | National Institutes of Health | |
| 156.40.197.0/24 since May 2015 | AS19050 | Business | U.S. Department of Health & Human Services | |
| 156.40.246.0/24 since Jul 2026 | AS19050 | Business | National Institutes of Health |
Registrations in this block
The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 156. | 23,808 | NIHNET-3 | National Institutes of Health (NIH-Z) · US | Direct Allocation | Dec 9, 1991 | citnsarin@ |
| 156. | 768 | UDHHS-4 | U.S. Department of Health & Human Services (UDHHS-4) · US | Direct Allocation | Dec 9, 1991 | citnsarin@ |
| 156. | 25,856 | NIHNET-3 | National Institutes of Health (NIH-Z) · US | Direct Allocation | Dec 9, 1991 | citnsarin@ |
| 156.40.197.0/24 | 256 | UDHHS-4 | U.S. Department of Health & Human Services (UDHHS-4) · US | Direct Allocation | Dec 9, 1991 | citnsarin@ |
| 156. | 14,848 | NIHNET-3 | National Institutes of Health (NIH-Z) · US | Direct Allocation | Dec 9, 1991 | citnsarin@ |
| └ 156.40.246.0/24 | 256 | UDHHS-4 | U.S. Department of Health & Human Services (C11646617) · US | Reassigned | Jul 10, 2026 | citnsarin@ via NIHNET-3 |
A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.
Network & registry
Registry
Holder
- Organization
- Not stated by the registry
Origin network
AS3527
US
- Name
- National Institutes of Health
- Type
- Business
- Registered
- Apr 7, 1994
- Domain
- nih.gov
- Industry
- Government and Regulatory Agencies, Administrations, Departments, and Services
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2020 · 6.5 yr
- Origin networks
- 2
- Last change of origin
- May 2020
Recorded history
History
- Handoffs
- 2
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS3527 | RADB | Proxy-registered route object for NIH | MAINT-AS10886 | Nov 13, 2023 |
IRR inside
Route objects inside
| Prefix | Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|---|
| 156.40.0.0/18 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.64.0/20 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.80.0/21 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.88.0/22 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.92.0/24 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.94.0/23 | AS19050 | ARIN | U.S. Department of Health & Human Services | MNT-UDHHS-4 | May 9, 2025 |
| 156.40.96.0/19 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.116.0/22 | AS3527 | RADB | Proxy-registered route object for NIH | MAINT-AS10886 | Nov 13, 2023 |
| 156.40.120.0/22 | AS3527 | RADB | Proxy-registered route object for NIH | MAINT-AS10886 | Nov 13, 2023 |
| 156.40.128.0/18 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.192.0/22 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.196.0/24 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.198.0/23 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.200.0/21 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.208.0/20 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.224.0/19 | AS3527 | ARIN | 9000 Rockville Pike | MNT-NIH-Z | Jun 5, 2025 |
| 156.40.254.0/23 | AS3527 | RADB | Proxy-registered route object for NIH | MAINT-AS10886 | Nov 13, 2023 |
| 156.40.254.0/24 | AS3527 | RADB | Proxy-registered route object for NIH | MAINT-AS10886 | Nov 13, 2023 |
| 156.40.255.0/24 | AS3527 | RADB | Proxy-registered route object for NIH | MAINT-AS10886 | Nov 13, 2023 |
Whois
Registration for this announcement
156.40.0.0/16 spans several registrations: 6 records are listed under Registrations.
- RIR
- ARIN
- Country
- US
- Delegated
- Dec 9, 1991
- Status
- assigned