Data as of Nov 3, 2026
16.5.72.0/21
Anonymizer · ISP proxyGTT Communications Inc. · space held by Hewlett Packard Enterprise Company
Announcement
this exact prefix
RPKI valid
Announced by
Type
ISP proxy
Risk
90 / 100 · Critical
Recent change
New origin Sep 2026
its first announcement on record
IPv4 market
Path
Announced by AS3257 since Sep 2026 · 7 wk ago
1 · Holder
record created May 18, 1989 · reallocated to Internet Utilities NA LLC Apr 18, 2026
4 · Use
ISP proxy
anonymizer space, operator not named
Operators, sellers and brokers
Leased from
IP brokers
| Name | In 16.5.72.0/21 | /24s |
|---|---|---|
| IPXO | 2,048100% | 8 |
Leased from
Owners leasing their own space
| Name | In 16.5.72.0/21 | /24s |
|---|---|---|
| Hewlett Packard Enterprise Company | 2,048100% | 8 |
Lineage
How this block came to its use, oldest first. The whole IPv4 market →
16.5.72.0/21
From the registry to its use
- May 18, 1989Registry recordHewlett Packard Enterprise CompanyDirect Allocation (legacy, pre-1997)16.5.0.0/16
- Apr 18, 2026ReallocatedInternet Utilities NA LLCReallocated16.5.0.0/16
- Sep 8, 2026AssignedInternet Utilities NA LLCReassigned16.5.72.0/21
- Sep 8, 2026Route objectIPXORADB route object for AS3257 GTT Communications Inc., maintainer MAINT-AS834
- Sep 8, 2026Route objectIPXOARIN route object for AS3257 GTT Communications Inc., maintainer MNT-DCL-577
- Sep 16, 2026– today
- todayLeased fromIPXOIP broker
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 |
|---|---|---|---|---|---|---|
| 16.5.0.0/16 | 65,536 | HPE-15 | Hewlett Packard Enterprise Company (HPE-15) · US | Direct Allocation | May 18, 1989 | [email protected] |
| └ 16.5.0.0/16 | 65,536 | IPXO-LLC | IPXO LLC (IL-845) · US | Reallocated | Apr 3, 2026 | [email protected] |
| └ 16.5.0.0/16 | 65,536 | NETUTILS | Internet Utilities NA LLC (DCL-577) · US | Reallocated | Apr 18, 2026 | [email protected] |
| └ 16.5.72.0/21 | 2,048 | NET-16-5-72-0-21 | unknown | Reassigned | Sep 8, 2026 | [email protected] via HPE-15 |
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
IPv4 market
Holder
- Organization
- Hewlett Packard Enterprise Company
- Handle
- HPE-15
- Range
- 16.5.0.0/16
- Registration type
- Direct Allocation
- Record created
- May 18, 1989
- Legacy
- yes
- Reallocated to
- Internet Utilities NA LLC (DCL-577)
- Reallocated
- Apr 18, 2026
Origin network
AS3257
US
- Name
- GTT Communications Inc.
- Type
- Internet provider
- Registered
- Sep 30, 1994
- Domain
- gtt.net
- Website
- www.gtt.net
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
- VPN servers
- 244
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Stable
- First seen
- Sep 2026
- Current origin since
- Sep 2026 · 2 mo
- Origin networks
- 1
Whois
Registration for this announcement
- Range
- 16.5.72.0/21
- Netname
- NET-16-5-72-0-21
- Registrant
- Internet Utilities NA LLC
- Organization
- Internet Utilities NA LLC (DCL-577)
- Org address
- 2711 Centerville Road, Wilmington, DE, 19808
- Org country
- US
- Type
- Reassigned
- Handle
- NET-16-5-72-0-1
- Parent
- NET-16-5-0-0-3
- Created
- Sep 8, 2026
- RIR
- ARIN
- Country
- US
- Delegated
- May 18, 1989
- Status
- assigned
Report abuse
Abuse contact
- [email protected]
- Name
- Internet Utilities Abuse
- Phone
- +1-650-934-1667
- Handle
- IUA-ARIN