NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 253
EXIANT COMMUNICATIONS LLC 2
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
2011-05-06 253-397-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2011-05-06 253-778-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMAWVLY WA
2011-05-04 253-343-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2011-04-23 253-358-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GIG HARBOR WA
2011-04-18 253-343-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-04-18 253-343-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-04-13 253-326-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
2011-03-29 253-432-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GIG HARBOR WA
2011-03-25 253-348-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-03-24 253-480-2XXX 2000–2999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 KENT WA
2011-03-22 253-620-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-03-02 253-245-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 AUBURN WA
2011-03-02 253-245-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 AUBURN WA
2011-02-28 253-666-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-02-28 253-666-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-02-25 253-397-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
2011-02-25 253-579-0XXX 0000–0999Assigned ONVOY, LLC - WA 483E TACOMA WA
2011-01-19 253-359-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-01-19 253-441-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-01-12 253-343-9XXX 9000–9999Assigned ONVOY, LLC - WA 483E TACOMA WA
2011-01-11 253-397-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 AUBURN WA
2011-01-11 253-778-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMAWVLY WA
2011-01-07 253-236-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J KENT WA
2010-12-22 253-802-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
2010-12-20 253-753-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2010-12-20 253-753-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2010-12-13 253-214-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E DES MOINES WA
2010-12-13 253-236-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E KENT WA
2010-12-13 253-528-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E DES MOINES WA
2010-11-24 253-666-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2010-11-24 253-693-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PUYALLUP WA
2010-11-22 253-245-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 AUBURN WA
2010-11-10 253-426-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2010-11-03 253-218-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AUBURN WA
2010-10-27 253-245-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F AUBURN WA
2010-10-27 253-256-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F PUYALLUP WA
2010-10-27 253-256-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F PUYALLUP WA
2010-10-27 253-470-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F SUMNER WA
2010-10-27 253-666-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2010-10-26 253-220-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F KENT WA
2010-10-26 253-666-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F TACOMA WA
2010-10-26 253-666-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F TACOMA WA
2010-10-26 253-666-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F TACOMA WA
2010-10-11 253-397-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J AUBURN WA
2010-10-07 253-336-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2010-10-07 253-336-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2010-09-30 253-802-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
2010-09-20 253-397-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 AUBURN WA
2010-09-14 253-426-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J TACOMA WA
2010-09-03 253-358-4XXX 4000–4999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 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.