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Data as of Nov 8, 2026

209.51.151.0/24

Anonymizer · ISP proxy

Frontier Communications of America, Inc. · space held by Network Transit Holdings LLC

Announcement
this exact prefix
RPKI valid
Announced by
AS5650
Type
ISP proxy
Risk
90 / 100 · Critical
IPv4 market

Path

1 · Holder
Network Transit Holdings LLC
record created Apr 22, 1997 · reallocated to Internet Utilities NA LLC Jan 7, 2025
2 · Leased from
IPXO
for its owner Network Transit Holdings LLC
3 · Announced by
AS5650 Frontier Communications of America, Inc.
since Nov 2024 · 24 mo ago
4 · Use
ISP proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 209.51.151.0/24/24s
IPXO
256100%
1
Leased from

Owners leasing their own space

NameIn 209.51.151.0/24/24s
Network Transit Holdings LLC
256100%
1

Lineage

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

209.51.151.0/24

From the registry to its use

  1. Apr 22, 1997
    Registry record
    Network Transit Holdings LLC
    Direct Allocation (legacy, pre-1997)
    209.51.145.0 - 209.51.159.255
  2. Nov 24, 2022– Oct 19, 2024
    Announced
    AS11042 Network Transit Holdings LLC
    Hosting
  3. Oct 20, 2024– Nov 12, 2024
    Announced
    AS834 IPXO LLC
    Hosting
  4. Nov 7, 2024
    Route object
    IPXO
    RADB route object for AS5650 Frontier Communications of America, Inc., maintainer MAINT-AS834
  5. Nov 13, 2024– today
    Announced
    AS5650 Frontier Communications of America, Inc.
    Internet provider
  6. Jan 7, 2025
    Reallocated
    Internet Utilities NA LLC
    Reallocated
    209.51.148.0/22
  7. Jan 7, 2025
    Assigned
    Internet Utilities NA LLC
    Reassigned
    209.51.151.0/24
  8. Jan 7, 2025
    Route object
    IPXO
    ARIN route object for AS5650 Frontier Communications of America, Inc., maintainer MNT-DCL-577
  9. 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
209.51.145.0 - 209.51.159.2553,840NTHLNetwork Transit Holdings LLC (NTHL) · USDirect AllocationApr 22, 1997abuse@networktransit.net
└ 209.51.148.0/221,024NET-209-51-148-0-22IPXO LLC (IL-845) · USReallocatedJul 15, 2024abuse@ipxo.com
└ 209.51.148.0/221,024NETUTILSInternet Utilities NA LLC (DCL-577) · USReallocatedJan 7, 2025report@abuseradar.com
└ 209.51.151.0/24256NET-209-51-151-0-24unknownReassignedJan 7, 2025report@abuseradar.com
via NET-209-51-148-0-22

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
IPv4 market

Holder

Holder in the market →
Organization
Network Transit Holdings LLC
Handle
NTHL
Range
209.51.145.0 - 209.51.159.255
Registration type
Direct Allocation
Record created
Apr 22, 1997
Legacy
yes
Reallocated to
Internet Utilities NA LLC (DCL-577)
Reallocated range
209.51.148.0/22
Reallocated
Jan 7, 2025
Origin network

AS5650

US
Name
Frontier Communications of America, Inc.
Type
Internet provider
Registered
Jul 25, 1995
Domain
verizonbusiness.com
Website
www.frontier.com
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed