NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
2023-05-03 575-298 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 HOBBS NM
2023-05-03 582-237 0XXX1XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J SOUTH FORK PA
2023-05-03 582-238 0XXX3XXX5XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J NANTY GLO PA
2023-05-03 618-941 1XXX which blocks → COMCAST IP PHONE, LLC 318J ALBION IL
2023-05-03 661-719 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PLDL PLDL CA
2023-05-03 667-433 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2023-05-03 680-900 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E BARNEVELD NY
2023-05-03 681-468 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PRKRSBGZN1 WV
2023-05-03 689-308 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 WINTERPARK FL
2023-05-03 707-960 0XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J RIO VISTA CA
2023-05-03 707-970 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J WINDSOR CA
2023-05-03 740-515 1XXX5XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K AMESVILLE OH
2023-05-03 779-397 2XXX3XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H CABERY IL
2023-05-03 781-946 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MEDFORD MA
2023-05-03 839-243 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CHESTER SC
2023-05-03 839-244 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K EDGEFIELD SC
2023-05-03 854-246 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CHARLESTON SC
2023-05-03 858-370 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-05-03 858-372 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-05-03 878-272 0XXX1XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SPRINGDALE PA
2023-05-03 878-273 4XXX which blocks → COMCAST IP PHONE, LLC 318J HOMER CITY PA
2023-05-03 934-900 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E BABYLON NY
2023-05-03 939-364 1XXX3XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J JUNCOS PR
2023-05-03 949-765 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LAGUNA BCH CA
2023-05-03 949-772 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LAGUNA BCH CA
2023-05-02 272-323 0XXX1XXX2XXX3XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J FRACKVILLE PA
2023-05-02 364-340 0XXX1XXX3XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H BROWNSVL KY
2023-05-02 437-656 not yet reported which blocks → Bell Mobility 6574 Toronto —
2023-05-02 437-657 not yet reported which blocks → Bell Mobility 6574 Toronto —
2023-05-02 608-715 0XXX2XXX7XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H ADAMS WI
2023-05-02 608-918 0XXX1XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SAUK CITY WI
2023-05-02 608-948 9XXX which blocks → ONVOY SPECTRUM, LLC 624H RIDGEWAY WI
2023-05-02 680-271 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J NEWARK NY
2023-05-02 742-213 not yet reported which blocks → Bell Mobility 6574 St. Catharines-Thorold —
2023-05-02 769-309 0XXX1XXX2XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MEADVILLE MS
2023-05-02 845-948 0XXX1XXX2XXX8XXX9XXX · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SLATE HILL NY
2023-05-02 845-949 0XXX4XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MONTGOMERY NY
2023-05-02 845-952 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CORNWALL NY
2023-05-02 901-696 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MEMPHIS TN
2023-05-01 318-863 8XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SHREVEPORT LA
2023-05-01 472-218 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CASTLEHAYN NC
2023-05-01 530-943 0XXX1XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J WILLOWS CA
2023-05-01 530-947 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J COLUSA CA
2023-05-01 534-215 0XXX2XXX7XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SOMERSET WI
2023-05-01 626-694 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALHAMBRA CA
2023-05-01 626-697 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALHAMBRA CA
2023-05-01 820-210 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CAMARILLO CA
2023-05-01 820-213 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CAMARILLO CA
2023-05-01 828-710 0XXX1XXX2XXX7XXX9XXX · 3 holders which blocks → NUSO, LLC 732J ASHEVILLE NC
2023-05-01 839-242 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BARNWELL SC

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.