NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 253-303

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 253-303 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 253 blocks

Most active assignees, all time — NPA 253
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 4
ONVOY, LLC - WA 3
ELTOPIA COMMUNICATIONS, LLC - WA 1
COMCAST IP PHONE, LLC 1
ASTOUND BROADBAND, LLC - WA 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2005-03-21 253-303-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J GIG HARBOR WA
2005-08-05 253-303-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 GIG HARBOR WA
2005-09-15 253-303-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 GIG HARBOR WA
2023-10-27 253-303-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 GIG HARBOR WA
2012-04-06 253-303-4XXX 4000–4999Assigned ASTOUND BROADBAND, LLC - WA 937F GIG HARBOR WA
2008-06-05 253-303-5XXX 5000–5999Assigned ONVOY, LLC - WA 483E GIG HARBOR WA
2017-09-12 253-303-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E GIG HARBOR WA
2008-08-08 253-303-7XXX 7000–7999Assigned ONVOY, LLC - WA 483E GIG HARBOR WA
2020-06-23 253-303-8XXX 8000–8999Assigned ELTOPIA COMMUNICATIONS, LLC - WA 663D GIG HARBOR WA
2014-09-12 253-303-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 GIG HARBOR WA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.