NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

7 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 509
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 3
NEW CINGULAR WIRELESS PCS, LLC 2
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
2015-06-09 509-350-6XXX 6000–6999Assigned METROPCS, INC. 5562 MOSES LAKE WA
2015-06-09 509-350-7XXX 7000–7999Assigned METROPCS, INC. 5562 MOSES LAKE WA
2015-06-08 509-390-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SOAP LAKE WA
2015-06-08 509-797-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 QUINCY WA
2015-05-21 509-598-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J SPOKANE WA
2015-05-21 509-790-1XXX 1000–1999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2015-05-13 509-571-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 YAKIMA WA
2015-04-10 509-820-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 KENNEWICK WA
2015-04-06 509-598-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2015-04-06 509-598-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2015-03-12 509-780-0XXX 0000–0999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F CLARKSTON WA
2015-03-03 509-964-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ELLENSBURG WA
2015-03-03 509-964-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ELLENSBURG WA
2015-02-17 509-445-0XXX 0000–0999Assigned PEND OREILLE TELEPHONE COMPANY 2418 CUSICK WA
2015-02-17 509-445-1XXX 1000–1999Assigned PEND OREILLE TELEPHONE COMPANY 2418 CUSICK WA
2015-02-17 509-445-2XXX 2000–2999Assigned PEND OREILLE TELEPHONE COMPANY 2418 CUSICK WA
2015-02-16 509-476-8XXX 8000–8999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F OROVILLE WA
2015-02-13 509-841-0XXX 0000–0999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F WAITSBURG WA
2015-02-12 509-553-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 COLFAX WA
2015-02-10 509-394-4XXX 4000–4999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F TOUCHET WA
2015-02-10 509-404-0XXX 0000–0999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F DAYTON WA
2015-02-10 509-524-9XXX 9000–9999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F WALLAWALLA WA
2015-02-10 509-631-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COULEE DAM WA
2015-02-05 509-968-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 ELLENSBURG WA
2015-01-27 509-203-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GRANDVIEW WA
2015-01-27 509-852-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLE ELUM WA
2015-01-19 509-818-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
2015-01-16 509-559-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CHENEY WA
2015-01-15 509-404-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DAYTON WA
2015-01-15 509-903-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 LIBERTY LK WA
2015-01-09 509-281-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 WH SALMON WA
2015-01-07 509-349-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WARDEN WA
2015-01-07 509-717-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EPHRATA WA
2015-01-07 509-761-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MOSES LAKE WA
2015-01-06 509-913-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OTHELLO WA
2014-12-29 509-571-9XXX 9000–9999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F YAKIMA WA
2014-12-26 509-245-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPANGLE WA
2014-12-26 509-253-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HARRINGTON WA
2014-12-26 509-257-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPRAGUE WA
2014-12-26 509-285-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OAKESDALE WA
2014-12-26 509-286-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ROCKFORD WA
2014-12-26 509-287-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 FARMINGTON WA
2014-12-26 509-345-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WILSON CRK WA
2014-12-26 509-390-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SOAP LAKE WA
2014-12-26 509-414-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELK-GRNBLF WA
2014-12-26 509-497-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BENTONCITY WA
2014-12-26 509-523-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ROSALIA WA
2014-12-26 509-553-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLFAX WA
2014-12-26 509-565-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MEDICAL LK WA
2014-12-26 509-566-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J POMEROY WA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.