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
2020-10-01 814-610 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J ALTOONA PA
2020-10-01 850-945 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - FL 937C SHALIMAR FL
2020-10-01 878-278 2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - PA 547E DARLINGTON PA
2020-10-01 904-604 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C FERNADNBCH FL
2020-09-30 218-593 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 MOORHEAD MN
2020-09-30 224-363 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2020-09-30 234-286 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 WOOSTER OH
2020-09-30 236-844 not yet reported which blocks → Fibernetics Corporation 464D Cobble Hill —
2020-09-30 236-845 not yet reported which blocks → Fibernetics Corporation 464D Cortes Island —
2020-09-30 236-846 not yet reported which blocks → Fibernetics Corporation 464D Gold River —
2020-09-30 251-501 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J MOBILE AL
2020-09-30 309-835 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 4 holders which blocks → IP HORIZON LLC 515J PEORIA IL
2020-09-30 313-552 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J DETROITZN1 MI
2020-09-30 314-806 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J ST LOUIS MO
2020-09-30 343-653 not yet reported which blocks → Westport Telephone Company Limited 920D Elgin —
2020-09-30 417-590 0–9 XXXall 10 · 5 holders which blocks → AIRESPRING, INC. 996H SPRINGFLD MO
2020-09-30 470-660 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 GAINESVL GA
2020-09-30 470-669 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 ATLANTA NE GA
2020-09-30 470-683 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 NEWNAN GA
2020-09-30 470-712 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 GRIFFIN GA
2020-09-30 540-617 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F CHRISTISBG VA
2020-09-30 567-327 0–9 XXXall 10 · 3 holders which blocks → IP HORIZON LLC 515J MANSFIELD OH
2020-09-30 608-398 0–9 XXXall 10 · 5 holders which blocks → AIRESPRING, INC. 996H MADISON WI
2020-09-30 612-895 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J TWINCITIES MN
2020-09-30 616-317 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J GRAND RPDS MI
2020-09-30 661-516 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J BKFD MAIN CA
2020-09-30 779-323 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J ROCKFORD IL
2020-09-30 813-697 0–9 XXXall 10 · 5 holders which blocks → AIRESPRING, INC. 996H TAMPACEN FL
2020-09-30 920-417 0–9 XXXall 10 · 2 holders which blocks → AIRESPRING, INC. 996H GREEN BAY WI
2020-09-30 989-357 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J BAY CITY MI
2020-09-29 206-672 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2020-09-29 218-558 0XXX1XXX3XXX5XXX6XXX9XXX · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BEMIDJI MN
2020-09-29 305-465 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H KEYS FL
2020-09-29 319-379 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J IOWA CITY IA
2020-09-29 405-876 0–9 XXXall 10 · 3 holders which blocks → AIRESPRING, INC. 996H OKLA CITY OK
2020-09-29 423-671 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J CHATTNOOGA TN
2020-09-29 425-532 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-09-29 431-926 not yet reported which blocks → Fibernetics Corporation 464D Anola —
2020-09-29 431-927 not yet reported which blocks → Fibernetics Corporation 464D Macdonald —
2020-09-29 431-928 not yet reported which blocks → Fibernetics Corporation 464D Stonewall —
2020-09-29 431-929 not yet reported which blocks → Fibernetics Corporation 464D Swan Lake —
2020-09-29 431-930 not yet reported which blocks → Fibernetics Corporation 464D Treherne —
2020-09-29 434-291 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → HD CARRIER LLC 321J LYNCHBURG VA
2020-09-29 434-833 0–9 XXXall 10 · 2 holders which blocks → HD CARRIER LLC 321J CHARLOTSVL VA
2020-09-29 470-657 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J ATLANTA NE GA
2020-09-29 470-710 0–9 XXXall 10 · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ATLANTA SO GA
2020-09-29 470-835 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J CUMMING GA
2020-09-29 502-576 0–9 XXXall 10 · 4 holders which blocks → AIRESPRING, INC. 996H LOUISVILLE KY
2020-09-29 540-618 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J CULPEPER VA
2020-09-29 580-642 0–9 XXXall 10 · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C DURANT OK

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.