NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-06-13 804-802 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H RICHMOND VA
2018-06-13 913-330 0XXX which blocks → RAINBOW COMMUNICATIONS, LLC - KS 330D LANCASTER KS
2018-06-12 202-227 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN1 DC
2018-06-12 240-648 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2018-06-12 240-649 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2018-06-12 309-350 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2018-06-12 431-490 not yet reported which blocks → Distributel 081E Amaranth —
2018-06-12 431-491 not yet reported which blocks → Distributel 081E Anola —
2018-06-12 431-516 not yet reported which blocks → Distributel 081E Poplar Point —
2018-06-12 431-517 not yet reported which blocks → Distributel 081E Rathwell —
2018-06-12 431-518 not yet reported which blocks → Distributel 081E Roland —
2018-06-12 431-519 not yet reported which blocks → Distributel 081E Sanford —
2018-06-12 431-520 not yet reported which blocks → Distributel 081E Sidney —
2018-06-12 431-521 not yet reported which blocks → Distributel 081E Somerset —
2018-06-12 431-522 not yet reported which blocks → Distributel 081E Southport —
2018-06-12 431-523 not yet reported which blocks → Distributel 081E Sperling —
2018-06-12 431-524 not yet reported which blocks → Distributel 081E St. Claude —
2018-06-12 431-525 not yet reported which blocks → Distributel 081E Starbuck —
2018-06-12 431-526 not yet reported which blocks → Distributel 081E Stephenfield —
2018-06-12 431-527 not yet reported which blocks → Distributel 081E St. Francois Xavier —
2018-06-12 431-528 not yet reported which blocks → Distributel 081E Stonewall —
2018-06-12 431-529 not yet reported which blocks → Distributel 081E Swan Lake —
2018-06-12 431-530 not yet reported which blocks → Distributel 081E Treherne —
2018-06-12 478-245 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D MACON GA
2018-06-12 515-718 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DES MOINES IA
2018-06-12 657-359 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SILVERADO CA
2018-06-12 667-238 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 PRESTON MD
2018-06-12 667-241 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 RIDGELY MD
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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.