NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days
8X8, INC. 39
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 15
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2004-05-27 514-266 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2004-05-27 514-267 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2004-05-27 571-229 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J MANASSAS VA
2004-05-27 647-206 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2004-05-27 647-207 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2004-05-27 647-208 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2004-05-27 647-209 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2004-05-27 712-870 5XXX6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MOVILLE IA
2004-05-27 870-635 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 W MEMPHIS AR
2004-05-27 906-239 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 IRON MT MI
2004-05-27 906-241 1XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ESCANABA MI
2004-05-26 307-271 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 POWELL WY
2004-05-26 570-217 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 MIFFLINBG PA
2004-05-26 615-738 0–9 XXXall 10 · 2 holders which blocks → POWERTEL NASHVILLE LICENSES, INC. 7476 NASHVILLE TN
2004-05-25 251-216 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AL 5255 EVERGREEN AL
2004-05-25 712-207 2XXX3XXX4XXX5XXX · 3 holders which blocks → WALNUT TELEPHONE COMPANY, INC. - IA 774B SHELBY IA
2004-05-25 712-407 1XXX2XXX4XXX7XXX · 3 holders which blocks → WALNUT TELEPHONE COMPANY, INC. - IA 774B MINDEN IA
2004-05-25 803-702 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - SC 5258 ALLENDALE SC
2004-05-25 828-202 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 FORESTCITY NC
2004-05-25 832-217 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
2004-05-25 843-253 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - SC 5258 CHERAW SC
2004-05-24 224-207 0–9 XXXall 10 · 3 holders which blocks → FIRST COMMUNICATIONS, LLC 460K LIBERTYVL IL
2004-05-24 224-383 0–9 XXXall 10 · 2 holders which blocks → FIRST COMMUNICATIONS, LLC 460K NORTHBROOK IL
2004-05-24 276-200 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F WYTHEVILLE VA
2004-05-24 307-688 not yet reported which blocks → QWEST CORPORATION 9636 GILLETTE WY
2004-05-24 312-506 0–9 XXXall 10 · 3 holders which blocks → FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-05-24 484-906 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHPHSBZN21 PA
2004-05-24 570-302 0XXX2XXX3XXX5XXX6XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 COVINGTON PA
2004-05-24 608-330 0–9 XXXall 10 · 6 holders which blocks → UNITED STATES CELLULAR - WI 6274 PLATTEVL WI
2004-05-24 630-967 0–9 XXXall 10 · 2 holders which blocks → FIRST COMMUNICATIONS, LLC 460K DOWNERSGRV IL
2004-05-24 631-891 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J PATCHOGUE NY
2004-05-24 708-468 0–9 XXXall 10 · 5 holders which blocks → FIRST COMMUNICATIONS, LLC 460K TINLEYPARK IL
2004-05-24 715-250 not yet reported which blocks → METRO SOUTHWEST PCS, LLP 9759 CLINTONVL WI
2004-05-24 773-537 0–9 XXXall 10 · 3 holders which blocks → FIRST COMMUNICATIONS, LLC 460K CHICGOZN04 IL
2004-05-24 847-666 0–9 XXXall 10 · 3 holders which blocks → FIRST COMMUNICATIONS, LLC 460K ARLIGTNHTS IL
2004-05-24 870-279 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DE QUEEN AR
2004-05-24 940-213 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 IOWA PARK TX
2004-05-21 630-957 0–9 XXXall 10 · 4 holders which blocks → FIRST COMMUNICATIONS, LLC 460K W CHICAGO IL
2004-05-21 773-565 0–9 XXXall 10 · 3 holders which blocks → FIRST COMMUNICATIONS, LLC 460K CHICGOZN06 IL
2004-05-20 720-247 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-05-20 740-931 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CHESHIRCTR OH
2004-05-20 910-557 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC 7835 HAMLET NC
2004-05-19 204-612 not yet reported which blocks → MTS Inc. 991B Winnipeg —
2004-05-19 307-257 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 GILLETTE WY
2004-05-19 307-278 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 BUFFALO WY
2004-05-19 307-288 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 EVANSTON WY
2004-05-19 307-298 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 DOUGLAS WY
2004-05-19 318-520 0–9 XXXall 10 · 4 holders which blocks → CP-TEL NETWORK SERVICES, INC. - LA 1762 CASTOR LA
2004-05-19 318-808 0XXX1XXX2XXX7XXX8XXX · 4 holders which blocks → CP-TEL NETWORK SERVICES, INC. - LA 1762 FLORIEN LA
2004-05-19 318-824 0–9 XXXall 10 · 5 holders which blocks → CP-TEL NETWORK SERVICES, INC. - LA 1762 ZWOLLE LA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.