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Data as of Nov 3, 2026

149.51.248.0/21

Anonymizer

RCN · space held by Cogent Communications, LLC

Announcement
this exact prefix
No RPKI
Announced by
AS6079
Type
Datacenter proxy
50% 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
AS6079 RCN
since Jul 2024 · 2.3 yr ago
4 · Use
Datacenter proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 149.51.248.0/21/24s
Rackdog
2,048100%
8
Leased from

Owners leasing their own space

NameIn 149.51.248.0/21/24s
Cogent Communications, LLC
2,048100%
8

Lineage

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

149.51.248.0/21

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– Nov 2, 2026
    Announced
    AS174 Cogent Communications, LLC
    as part of 149.50.0.0/15
    149.50.0.0/15
  3. May 28, 2022– Aug 7, 2022
    Announced
    AS398465 Rackdog, LLC
    Hosting
  4. Oct 19, 2022– Oct 30, 2022
    Announced
    AS399928 Paulding Putnam Electric Trust, Inc.
    Internet provider
  5. Nov 12, 2022– Dec 12, 2023
    Announced
    AS980 Northern Cable and Fiber, LLC
  6. Dec 1, 2023– Jul 15, 2024
    Announced
    AS966 Cable & Fiberlink
  7. Jun 13, 2024
    Route object
    Rackdog
    RADB route object for AS6079 RCN, maintainer MAINT-AS398465
  8. Jul 4, 2024– Nov 2, 2026
    Announced
    AS6079 RCN
    Internet provider
  9. May 27, 2026
    Assigned
    RCN
    Reassigned
    149.51.192.0/18
  10. 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)3,385
978 always on
More specific

Announcements inside

PrefixOriginTypeLeased fromHolderRPKI
149.51.250.0/24
since Sep 2026
AS398465Datacenter proxyCogent Communications, LLC
149.51.251.0/24
since Nov 2025
AS398465Datacenter proxyIP broker RackdogCogent Communications, LLC
149.51.254.0/23
since Nov 2025
AS398465Datacenter proxyIP 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, 1992[email protected]
└ 149.51.192.0/1816,384RACKDOG-CGNT-NET-12RCN (C11605110) · USReassignedMay 27, 2026[email protected]
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

2,048 addresses
TypeAddressesShareRanges
Datacenter proxyanonymizer1,02450%3
ISP proxyanonymizer1,02450%2

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
IPv4 market

Holder

Holder in the market →
Organization
Cogent Communications, LLC
Handle
COGC
Range
149.51.0.0/16
Registration type
Direct Allocation
Record created
Jan 28, 1992
Legacy
yes
Origin network

AS6079

US
Name
RCN
Type
Internet provider
Registered
Apr 4, 2001
Domain
astound.com
Website
www.astound.com
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed