NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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, all time — NPA 813
FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 233
AERIAL COMMUNICATIONS, INC. 96
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 73
METROPCS, INC. 53
NEW CINGULAR WIRELESS PCS, LLC - GA 47
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
— 813-774 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 TAMPACEN FL
— 813-775 5XXX8XXX which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPA FL
— 813-778 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ZEPHYRHILS FL
— 813-779 5XXX which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 ZEPHYRHILS FL
— 813-780 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 ZEPHYRHILS FL
— 813-781 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 TAMPA FL
— 813-782 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 ZEPHYRHILS FL
— 813-783 none assigned yet which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 ZEPHYRHILS FL
— 813-784 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 TAMPA FL
— 813-785 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 TAMPA FL
— 813-786 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 TAMPA FL
— 813-787 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 TAMPA FL
— 813-788 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 ZEPHYRHILS FL
— 813-789 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 TAMPA FL
— 813-792 3XXX4XXX6XXX which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPAWST FL
— 813-794 not yet reported which blocks → PAETEC ITEL, LLC 829J TAMPANTH FL
— 813-795 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 TAMPA FL
— 813-799 0–9 XXXwhole prefix which blocks → HD CARRIER LLC 321J TAMPASTH FL
— 813-801 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-805 8XXX which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-806 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX FL
— 813-814 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPAWST FL
— 813-818 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPAWST FL
— 813-823 0–9 XXXwhole prefix which blocks → HD CARRIER LLC 321J TAMPAEST FL
— 813-824 0–9 XXXwhole prefix which blocks → HD CARRIER LLC 321J TAMPANTH FL
— 813-827 not yet reported which blocks → LEVEL 3 TELECOM OF FLORIDA, LP - FL 7635 TAMPACEN FL
— 813-828 not yet reported which blocks → LEVEL 3 TELECOM OF FLORIDA, LP - FL 7635 TAMPACEN FL
— 813-829 1XXX4XXX · 2 holders which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPA FL
— 813-830 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-831 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-832 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-833 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 TAMPA FL
— 813-835 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-837 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-839 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-840 3XXX4XXX which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-844 not yet reported which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
— 813-845 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 ZEPHYRHILS FL
— 813-849 3XXX4XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J TAMPA FL
— 813-852 4XXX5XXX · 2 holders which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPAWST FL
— 813-854 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPAWST FL
— 813-855 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPAWST FL
— 813-856 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 PLANT CITY FL
— 813-857 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 TAMPA FL
— 813-862 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ZEPHYRHILS FL
— 813-864 not yet reported which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPA FL
— 813-865 5XXX9XXX which blocks → PAETEC ITEL, LLC 829J TAMPA FL
— 813-866 not yet reported which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL
— 813-868 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA 0328 TAMPACEN FL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.