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Data as of Nov 15, 2026

16.221.56.0/21

Anonymizer · ISP proxy

Cox Communications Inc. · space held by Hewlett Packard Enterprise Company

Announcement
this exact prefix
RPKI valid
Announced by
AS22773
Type
ISP proxy
Risk
90 / 100 · Critical
Recent change
New origin Oct 10, 2026
its first announcement on record
registry: reallocated to Internet Utilities NA LLC by Hewlett Packard Enterprise Company, May 29, 2026
IPv4 market

Path

Announced by AS22773 since Oct 10, 2026 · 5 wk ago
1 · Holder
Hewlett Packard Enterprise Company
record created May 18, 1989 · reallocated to Internet Utilities NA LLC May 29, 2026
2 · Leased from
Hewlett Packard Enterprise Company
its owner, directly
3 · Announced by
AS22773 Cox Communications Inc.
since Oct 10, 2026 · 5 wk ago
4 · Use
ISP proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

Owners leasing their own space

NameIn 16.221.56.0/21/24s
Hewlett Packard Enterprise Company
2,048100%
8

Lineage

How this block came to its use, oldest first. The whole IPv4 market →

16.221.56.0/21

From the registry to its use

  1. May 18, 1989
    Registry record
    Hewlett Packard Enterprise Company
    Direct Allocation (legacy, pre-1997)
    16.220.0.0 - 16.242.255.255
  2. May 29, 2026
    Reallocated
    Internet Utilities NA LLC
    Reallocated
    16.220.0.0/14
  3. Oct 1, 2026
    Assigned
    Exo Broadband
    Reassigned
    16.221.56.0/21
  4. Oct 1, 2026
    Route object
    IPXO
    RADB route object for AS6079 RCN, maintainer MAINT-AS834
  5. Oct 1, 2026
    Route object
    IPXO
    ARIN route object for AS6079 RCN, maintainer MNT-DCL-577
  6. Oct 1, 2026
    Route object
    IPXO
    RADB route object for AS7029 Windstream Communications LLC, maintainer MAINT-AS834
  7. Oct 1, 2026
    Route object
    IPXO
    ARIN route object for AS7029 Windstream Communications LLC, maintainer MNT-DCL-577
  8. Oct 1, 2026
    Route object
    IPXO
    RADB route object for AS11404 Wave Broadband, maintainer MAINT-AS834
  9. Oct 1, 2026
    Route object
    IPXO
    ARIN route object for AS11404 Wave Broadband, maintainer MNT-DCL-577
  10. Oct 1, 2026
    Route object
    IPXO
    RADB route object for AS22773 Cox Communications Inc., maintainer MAINT-AS834
  11. Oct 1, 2026
    Route object
    IPXO
    ARIN route object for AS22773 Cox Communications Inc., maintainer MNT-DCL-577
  12. Oct 10, 2026– today
    Announced
    AS22773 Cox Communications Inc.
    Internet provider
  13. today
    Leased from
    IPXO
    IP 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.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
16.220.0.0 - 16.242.255.2551,507,328HPE-15Hewlett Packard Enterprise Company (HPE-15) · USDirect AllocationMay 18, 1989IPv4.notices@hpe.com
└ 16.220.0.0/14262,144NET-16-220-IL-845IPXO LLC (IL-845) · USReallocatedMay 15, 2026abuse@ipxo.com
└ 16.220.0.0/14262,144NETUTILSInternet Utilities NA LLC (DCL-577) · USReallocatedMay 29, 2026report@abuseradar.com
└ 16.221.56.0/212,048NET-16-221-56-0-21Exo Broadband (C11725620) · USReassignedOct 1, 2026report@abuseradar.com
via NET-16-220-IL-845

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

AnnouncementRouting historyRPKI & IRRWhois & abuse
Routing timeline

Who has announced this prefix

Summary

Routing history

Pattern
Stable
First seen
Oct 10, 2026
Current origin since
Oct 10, 2026 · 1 mo
Origin networks
1