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
Download CSV ↓
Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-06-14 631-313 0–9 XXXall 10 · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 ISLIP NY
2018-06-14 639-329 not yet reported which blocks → Bell Mobility 6574 Avonlea —
2018-06-14 712-639 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D SIOUX CITY IA
2018-06-14 720-926 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2018-06-14 843-942 0–9 XXXall 10 · 7 holders which blocks → VONAGE AMERICA LLC 197D FLORENCE SC
2018-06-14 928-655 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SOMERTON AZ
2018-06-14 939-577 0–9 XXXall 10 · 2 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 BAYAMONNOR PR
2018-06-13 325-249 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → VONAGE AMERICA LLC 197D SAN ANGELO TX
2018-06-13 401-600 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H PROVIDENCE RI
2018-06-13 442-290 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D PALM SPG CA
2018-06-13 518-995 0XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC- NY 384C WILMINGTON NY
2018-06-13 581-760 not yet reported which blocks → Bell Canada 984C Saint-Agapit —
2018-06-13 612-394 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 TWINCITIES MN
2018-06-13 681-234 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN6 WV
2018-06-13 681-297 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PRKRSBGZN3 WV
2018-06-13 681-381 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN3 WV
2018-06-13 681-387 0XXX1XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN2 WV
2018-06-13 681-432 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN1 WV
2018-06-13 681-505 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN4 WV
2018-06-13 681-588 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PRKRSBGZN1 WV
2018-06-13 681-689 2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN4 WV
2018-06-13 715-481 0XXX which blocks → VONAGE AMERICA LLC 197D EAU CLAIRE WI
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

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.