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
2018-03-13 254-342 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D WACO TX
2018-03-13 309-327 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D PEORIA IL
2018-03-13 318-642 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VONAGE AMERICA LLC 197D SHREVEPORT LA
2018-03-13 320-636 1XXX2XXX8XXX · 3 holders which blocks → TEKSTAR COMMUNICATIONS, INC. 4156 SOUTHHAVEN MN
2018-03-13 323-814 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 09 CA
2018-03-13 323-955 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 13 CA
2018-03-13 323-990 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 04 CA
2018-03-13 334-604 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D MONTGOMERY AL
2018-03-13 337-399 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → VONAGE AMERICA LLC 197D LAFAYETTE LA
2018-03-13 346-324 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HOUSTON TX
2018-03-13 361-257 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D C CHRISTI TX
2018-03-13 430-240 0–9 XXXall 10 · 7 holders which blocks → VONAGE AMERICA LLC 197D LONGVIEW TX
2018-03-13 484-460 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 ALLENTOWN PA
2018-03-13 510-929 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2018-03-13 548-388 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 London —
2018-03-13 548-588 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 London —
2018-03-13 548-788 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 London —
2018-03-13 613-672 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Kanata-Stittsville —
2018-03-13 631-508 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 RIVERHEAD NY
2018-03-13 639-802 not yet reported which blocks → Iristel Inc. 154E Moosomin —
2018-03-13 657-522 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-13 762-716 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - GA 067D AUGUSTA GA
2018-03-13 763-663 1XXX3XXX · 2 holders which blocks → TEKSTAR COMMUNICATIONS, INC. 4156 GLENDORADO MN
2018-03-13 785-775 not yet reported which blocks → WTC TECHNOLOGIES, INC. - KS 136J MANHATTAN KS
2018-03-13 915-250 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D EL PASO TX
2018-03-13 938-200 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D HUNTSVILLE AL
2018-03-13 956-338 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D BROWNSVL TX
2018-03-12 236-607 not yet reported which blocks → Iristel Inc. 154E Vancouver —
2018-03-12 236-628 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Nanaimo —
2018-03-12 236-633 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Kelowna —
2018-03-12 346-318 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F ALVIN TX
2018-03-12 407-653 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 KISSIMMEE FL
2018-03-12 458-234 0–9 XXXall 10 · 7 holders which blocks → VONAGE AMERICA LLC 197D EUGENE OR
2018-03-12 506-605 not yet reported which blocks → Aliant Telecom(NB) 8090 Saint John —
2018-03-12 506-718 not yet reported which blocks → Iristel Inc. 154E Tracadie —
2018-03-12 782-400 not yet reported which blocks → Iristel Inc. 154E Yarmouth —
2018-03-12 782-502 not yet reported which blocks → Aliant Telecom (NS) 8089 Halifax —
2018-03-12 850-741 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D PENSACOLA FL
2018-03-12 873-301 not yet reported which blocks → Iristel Inc. 154E Ville-Marie —
2018-03-09 205-734 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BIRMINGHAM AL
2018-03-09 256-678 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 7469 HUNTSVILLE AL
2018-03-09 307-776 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D CASPER WY
2018-03-09 315-273 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E HAMILTON NY
2018-03-09 319-419 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 WAVERLY IA
2018-03-09 323-991 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 08 CA
2018-03-09 346-297 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F HSTNSUBURB TX
2018-03-09 346-298 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SPRING TX
2018-03-09 417-803 1XXX which blocks → MCC TELEPHONY LLC 593K MILLER MO
2018-03-09 469-431 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F GRANDPRARI TX
2018-03-09 515-630 0–9 XXXall 10 · 2 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F DES MOINES IA

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.