NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
2015-02-26 314-379 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2015-02-26 501-478 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
2015-02-26 504-900 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - LA 749E NEWORLEANS LA
2015-02-26 507-668 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → QWEST CORPORATION 9631 ALBERT LEA MN
2015-02-26 520-500 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E TUCSON AZ
2015-02-26 573-987 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JACKSON MO
2015-02-26 720-598 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2015-02-26 725-590 0–9 XXXwhole prefix which blocks → CENTRAL TEL. CO. - NEVADA DBA CENTURYLINK 2348 LAS VEGAS NV
2015-02-26 848-242 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 PERTHAMBOY NJ
2015-02-26 862-295 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 PASSAIC NJ
2015-02-25 248-710 0–9 XXXall 10 · 6 holders which blocks → GRID 4 COMMUNICATIONS, INC. - MI 9714 ROCHESTER MI
2015-02-25 309-777 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E IPAVA IL
2015-02-25 438-498 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2015-02-25 438-499 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2015-02-25 502-936 0–9 XXXwhole prefix which blocks → POWERTEL KENTUCKY LICENSES, INC. 365C LOUISVILLE KY
2015-02-25 518-988 0XXX1XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → INTEGRATED PATH COMMUNICATIONS, LLC - NY 271G HILLSDALE NY
2015-02-25 715-997 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 STEVENS PT WI
2015-02-25 731-224 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F HALLS TN
2015-02-25 734-881 0–9 XXXall 10 · 5 holders which blocks → GRID 4 COMMUNICATIONS, INC. - MI 9714 ANN ARBOR MI
2015-02-25 803-559 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 6 holders which blocks → IDT AMERICA, CORP. - SC 467E WAGENER SC
2015-02-25 807-700 not yet reported which blocks → Iristel Inc. 154E Thunder Bay —
2015-02-25 859-777 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - KY 896E COVINGTON KY
2015-02-25 859-888 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - KY 896E COVINGTON KY
2015-02-25 913-229 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - KS 6532 KANSASCITY KS
2015-02-24 216-612 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CLEVELAND OH
2015-02-24 217-998 1XXX7XXX8XXX9XXX · 3 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F GAYS IL
2015-02-24 219-999 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D GARY IN
2015-02-24 302-509 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HOCKESSIN DE
2015-02-24 317-798 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CARMEL IN
2015-02-24 323-794 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2015-02-24 337-800 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - LA 749E ABBEVILLE LA
2015-02-24 424-386 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2015-02-24 424-395 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MALIBU CA
2015-02-24 504-603 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - LA 153F NEWORLEANS LA
2015-02-24 779-706 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SANDWICH IL
2015-02-24 779-804 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 PONTIAC IL
2015-02-24 916-664 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SCRM NORTH CA
2015-02-23 205-971 0–9 XXXwhole prefix which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 BIRMINGHAM AL
2015-02-23 239-316 0–9 XXXall 10 · 6 holders which blocks → ORLANDO TELEPHONE COMPANY DBA SUMMIT BROADBAND 7857 NAPLES FL
2015-02-23 239-319 0–9 XXXall 10 · 5 holders which blocks → ORLANDO TELEPHONE COMPANY DBA SUMMIT BROADBAND 7857 BONITA SPG FL
2015-02-23 251-999 0–9 XXXwhole prefix which blocks → ONVOY, LLC - AL 604E MOBILE AL
2015-02-23 475-206 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2015-02-23 502-443 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - KY 987E LA GRANGE KY
2015-02-23 505-297 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2015-02-23 516-737 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NASSAUZN02 NY
2015-02-23 551-262 0–9 XXXall 10 · 7 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 RAMSEY NJ
2015-02-23 714-909 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SILVERADO CA
2015-02-23 757-998 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 NRFOLKZON3 VA
2015-02-23 818-818 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 NORTHRIDGE CA
2015-02-23 848-234 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 FREEHOLD NJ

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.