NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
2017-10-24 517-722 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 MASON MI
2017-10-24 606-449 0–9 XXXall 10 · 4 holders which blocks → POWERTEL KENTUCKY LICENSES, INC. 365C MIDDLESBO KY
2017-10-24 864-733 0–9 XXXall 10 · 7 holders which blocks → SOUTH CAROLINA TELECOMM GRP HOLDINGS, LLC - SC 527H GRAY COURT SC
2017-10-23 224-266 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ELK GROVE IL
2017-10-23 234-237 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AKRON OH
2017-10-23 312-392 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C CHICGOZN01 IL
2017-10-23 779-246 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ROCHELLE IL
2017-10-20 239-238 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 NAPLES FL
2017-10-20 312-736 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2017-10-20 312-741 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J CHICGOZN01 IL
2017-10-20 406-306 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F MANHATTAN MT
2017-10-20 959-208 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEWBRITAIN CT
2017-10-19 206-945 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SEATTLE WA
2017-10-19 208-616 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H BOISE ID
2017-10-19 218-292 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MN 184D BEAR RIVER MN
2017-10-19 223-777 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - PA 547E STRASBURG PA
2017-10-19 312-639 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
2017-10-19 312-728 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
2017-10-19 316-358 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WICHITA KS
2017-10-19 458-232 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 KLAMATHFLS OR
2017-10-19 507-605 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → ONVOY, LLC - MN 184D BREWSTER MN
2017-10-19 608-507 1XXX7XXX · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BOAZ WI
2017-10-19 608-595 0XXX2XXX5XXX7XXX · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BLUE RIVER WI
2017-10-19 608-887 0XXX2XXX5XXX7XXX8XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GAYS MILLS WI
2017-10-19 608-955 2XXX5XXX7XXX9XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SOLDIRSGRV WI
2017-10-19 628-258 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 NICASIO CA
2017-10-19 747-269 0–9 XXXall 10 · 6 holders which blocks → METROPCS NETWORKS, LLC 899D SNFN SPLV CA
2017-10-19 870-359 0–9 XXXall 10 · 5 holders which blocks → RED RIVER CELLULAR TELEPHONE CORPORATION - AR 095J HOPE AR
2017-10-19 870-361 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → RED RIVER CELLULAR TELEPHONE CORPORATION - AR 095J TEXARKANA AR
2017-10-19 951-449 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PERRIS CA
2017-10-19 972-972 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C DALLAS TX
2017-10-18 226-503 not yet reported which blocks → Videotron Ltd. 787G London —
2017-10-18 226-507 not yet reported which blocks → Videotron Ltd. 787G Kitchener-Waterloo —
2017-10-18 346-279 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 SUGAR LAND TX
2017-10-18 479-888 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AR 348F MENA AR
2017-10-18 618-500 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C GRANITE CY IL
2017-10-18 639-344 not yet reported which blocks → TELUS Mobility 8303 Prince Albert —
2017-10-18 870-888 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AR 348F ASHDOWN AR
2017-10-17 229-999 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - GA 067D GEORGETOWN GA
2017-10-17 281-939 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL 9533 SPRING TX
2017-10-17 331-235 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IL
2017-10-17 551-215 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HACKENSACK NJ
2017-10-17 581-562 not yet reported which blocks → Videotron Ltd. 8306 Rimouski —
2017-10-17 581-748 not yet reported which blocks → Videotron Ltd. 328F Quebec —
2017-10-17 662-666 0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - MS 719E VERONA MS
2017-10-17 848-259 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DUNELLEN NJ
2017-10-17 857-306 0–9 XXXall 10 · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BOSTON MA
2017-10-17 857-315 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BOSTON MA
2017-10-17 908-365 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELIZABETH NJ
2017-10-17 912-666 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - GA 067D SAVANNAH GA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.