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Data as of Nov 15, 2026

149.51.208.0/20

2,560 anonymizer addresses · 63% · ISP proxy

Windstream Communications LLC · space held by Cogent Communications, LLC

Announcement
this exact prefix
No RPKI
Announced by
AS7029
Type
ISP proxy
63% of it
IPv4 market

Path

1 · Holder
Cogent Communications, LLC
record created Jan 28, 1992
2 · Leased from
Rackdog
for its owner Cogent Communications, LLC
3 · Announced by
AS7029 Windstream Communications LLC
since Nov 2025 · 12 mo ago
4 · Use
ISP proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 149.51.208.0/20/24s
Rackdog
2,56063%
10
Leased from

Owners leasing their own space

NameIn 149.51.208.0/20/24s
Cogent Communications, LLC
2,56063%
10

Lineage

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

149.51.208.0/20

From the registry to its use

  1. Jan 28, 1992
    Registry record
    Cogent Communications, LLC
    Direct Allocation (legacy, pre-1997)
    149.51.0.0/16
  2. Sep 15, 2006– today
    Announced
    AS174 Cogent Communications, LLC
    as part of 149.50.0.0/15
    149.50.0.0/15
  3. Dec 1, 2023– Nov 19, 2025
    Announced
    AS7018 AT&T Enterprises, LLC
    Internet provider
  4. Nov 8, 2025– today
    Announced
    AS7029 Windstream Communications LLC
    Internet provider
  5. May 27, 2026
    Assigned
    RCN
    Reassigned
    149.51.192.0/18
  6. Jul 29, 2026
    Route object
    AS398465 Rackdog, LLC
    RADB route object for AS398465 Rackdog, LLC, maintainer MAINT-AS22773
  7. Jul 29, 2026
    Route object
    AS398465 Rackdog, LLC
    RADB route object for AS398465 Rackdog, LLC, maintainer MAINT-AS22773
    149.51.212.0/23
  8. today
    Leased from
    Rackdog
    IP broker

Announcements

Less specific

Covering announcements

PrefixOriginTypeLeased fromProxy exitsRPKI
149.50.0.0/15
since Sep 2006
AS174Internet providerIP broker Rackdog (part)3,249
907 always on
More specific

Announcements inside

PrefixOriginTypeLeased fromHolderRPKI
149.51.208.0/24
since Dec 2025
AS398465HostingIP broker RackdogCogent Communications, LLC
149.51.210.0/24
since Nov 2025
AS7029ISP proxyIP broker RackdogCogent Communications, LLC
149.51.211.0/24
since Feb 2023
AS398465HostingIP broker RackdogCogent Communications, LLC
149.51.212.0/24
since May 2023
AS398465HostingIP broker RackdogCogent Communications, LLC
149.51.213.0/24
since Apr 2023
AS398465HostingIP broker RackdogCogent Communications, LLC
149.51.214.0/24
since Jun 2023
AS398465HostingIP broker RackdogCogent Communications, LLC
149.51.215.0/24
since Feb 2023
AS399296HostingIP broker RackdogCogent Communications, LLC

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
149.51.0.0/1665,536COGENT-149-51-16Cogent Communications, LLC (COGC) · USDirect AllocationJan 28, 1992abuse@cogentco.com
└ 149.51.192.0/1816,384RACKDOG-CGNT-NET-12RCN (C11605110) · USReassignedMay 27, 2026abuse@cogentco.com
via COGENT-149-51-16

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Composition

The types across the prefix's announced space, by addresses.

Announced space

Address share

Announced space

Types across the prefix

4,096 addresses
TypeAddressesShareRanges
ISP proxyanonymizer2,56063%3
Hosting1,53638%6

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Routing timeline

Covering aggregate above, the prefix's own history below

Summary

Routing history

Pattern
Rotating
First seen
Dec 2023
Current origin since
Nov 2025 · 1.0 yr
Origin networks
2
Last change of origin
Nov 2025
Recorded history

History

Handoffs
1