Data as of Nov 7, 2026
216.51.37.0/24
No anonymizer space · no proxy exits in 30 daysAmerican College of Cardiology · reallocated from Verizon Business
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 216.51.0.0/17 since May 2005 | AS2828 | Internet provider | 1 | Verizon Business |
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 |
|---|---|---|---|---|---|---|
| 216. | 98,304 | ALGX-KVX-BLK3 | Verizon Business (MCICS) · US | Direct Allocation | Aug 25, 1998 | abuse@ |
| └ 216.51.37.0/24 | 256 | 2400N-XOXO-216-51-37-0 | American College of Cardiology (ACC-12) · US | Reallocated | Nov 14, 2016 | noc@ |
Network & registry
IPv4 market
Holder
- Organization
- Verizon Business
- Handle
- MCICS
- Range
- 216.
50. 0. 0 - 216. 51. 127. 255 - Registration type
- Direct Allocation
- Record created
- Aug 25, 1998
- Reallocated to
- American College of Cardiology (ACC-12)
- Reallocated range
- 216.
51. 37. 0/ 24 - Reallocated
- Nov 14, 2016
Origin network
AS20286
US
- Name
- American College of Cardiology
- Type
- Business
- Registered
- Aug 11, 2006
- Domain
- acc.org
- Industry
- Colleges, Universities, and Professional Schools
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Dec 2013
- Current origin since
- Nov 2016 · 10.0 yr
- Origin networks
- 2
- Last change of origin
- Nov 2016
Recorded history
History
- Handoffs
- 1
Whois
Registration for this announcement
- Range
- 216.
51. 37. 0/ 24 - Netname
- 2400N-XOXO-216-51-37-0
- Registrant
- American College of Cardiology
- Organization
- American College of Cardiology (ACC-12)
- Org address
- 2400 N Street NW, Washington, DC, 20037
- Org country
- US
- Type
- Reallocated
- Handle
- NET-216-51-37-0-1
- Parent
- NET-216-50-0-0-1
- Created
- Nov 14, 2016
- RIR
- ARIN
- Country
- US
- Delegated
- Aug 25, 1998
- Status
- assigned
Report abuse
Abuse contact
- noc@
acc. org - Name
- Network Operations
- Phone
- +1-202-375-6000
- Handle
- NETWO8605-ARIN