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
2018-06-12 667-242 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 ROCK HALL MD
2018-06-12 667-244 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 STILL POND MD
2018-06-12 667-245 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 CECILTON MD
2018-06-12 667-246 0–9 XXXwhole prefix which blocks → CORE COMMUNICATIONS, INC.- MD 2593 CENTREVL MD
2018-06-12 667-247 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 CHESAPKECY MD
2018-06-12 667-248 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 DENTON MD
2018-06-12 667-249 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 GALENA MD
2018-06-12 681-322 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → VONAGE AMERICA LLC 197D CHRLSTNZN4 WV
2018-06-12 720-727 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F LONGMONT CO
2018-06-12 845-506 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C PORTJERVIS NY
2018-06-12 845-604 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C MONROE NY
2018-06-12 951-518 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2018-06-11 217-606 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D SPRINGFLD IL
2018-06-11 240-596 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2018-06-11 240-598 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 HUGHESVL MD
2018-06-11 240-610 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN4 MD
2018-06-11 240-622 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 LA PLATA MD
2018-06-11 240-628 0–9 XXXall 10 · 5 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 MECHANCSVL MD
2018-06-11 240-634 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2018-06-11 240-635 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2018-06-11 240-637 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-06-11 240-647 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 CLEAR SPG MD
2018-06-11 240-679 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 FRIENDSVL MD
2018-06-11 302-390 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - DE 6393 GEORGETOWN DE
2018-06-11 302-445 0–9 XXXall 10 · 3 holders which blocks → CORETEL DELAWARE, INC. - DE 1991 BRIDGEVL DE
2018-06-11 302-446 0–9 XXXall 10 · 3 holders which blocks → CORETEL DELAWARE, INC. - DE 1991 CAMDEN DE
2018-06-11 302-447 0–9 XXXall 10 · 2 holders which blocks → CORETEL DELAWARE, INC. - DE 1991 GEORGETOWN DE
2018-06-11 302-459 0–9 XXXall 10 · 4 holders which blocks → CORETEL DELAWARE, INC. - DE 1991 MILFORD DE
2018-06-11 302-461 0–9 XXXwhole prefix which blocks → CORETEL DELAWARE, INC. - DE 1991 NEWARK DE
2018-06-11 302-471 0–9 XXXall 10 · 5 holders which blocks → CORETEL DELAWARE, INC. - DE 1991 SMYRNA DE
2018-06-11 431-494 not yet reported which blocks → Distributel 081E Dugald —
2018-06-11 431-495 not yet reported which blocks → Distributel 081E Edwin —
2018-06-11 431-496 not yet reported which blocks → Distributel 081E Elie —
2018-06-11 431-497 not yet reported which blocks → Distributel 081E Elm Creek —
2018-06-11 431-498 not yet reported which blocks → Distributel 081E Gladstone —
2018-06-11 431-499 not yet reported which blocks → Distributel 081E Hazelridge —
2018-06-11 431-501 not yet reported which blocks → Distributel 081E Holland —
2018-06-11 431-502 not yet reported which blocks → Distributel 081E Langruth —
2018-06-11 431-503 not yet reported which blocks → Distributel 081E Macdonald —
2018-06-11 431-504 not yet reported which blocks → Distributel 081E Macgregor —
2018-06-11 431-505 not yet reported which blocks → Distributel 081E Miami —
2018-06-11 431-512 not yet reported which blocks → Distributel 081E Notre Dame de Lourdes —
2018-06-11 431-513 not yet reported which blocks → Distributel 081E Oakbank —
2018-06-11 431-514 not yet reported which blocks → Distributel 081E Oakville —
2018-06-11 431-515 not yet reported which blocks → Distributel 081E Pilot Mound —
2018-06-11 470-402 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GRIFFIN GA
2018-06-11 571-523 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2018-06-11 581-507 not yet reported which blocks → Iristel Inc. 154E Baie-Comeau (Hauterive) —
2018-06-11 667-236 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 PERRYVILLE MD
2018-06-11 667-237 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WEST RIVER MD

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.