NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 314
SOUTHWESTERN BELL 255
NEW CINGULAR WIRELESS PCS, LLC - IL 101
T-MOBILE USA, INC. 94
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 53
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 51
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
— 314-846 not yet reported which blocks → SOUTHWESTERN BELL 9533 OAKVILLE MO
— 314-848 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-849 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
— 314-851 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-852 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-853 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-854 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-855 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-856 2XXX3XXX5XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 KIRKWOOD MO
— 314-862 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-863 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-865 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-867 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-868 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-869 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-870 not yet reported which blocks → SPOK, INC. 6630 LADUE MO
— 314-871 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ST LOUIS MO
— 314-872 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-873 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-874 2XXX3XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-877 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-878 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-879 4XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-880 not yet reported which blocks → PAETEC ITEL, LLC 829J ST LOUIS MO
— 314-881 8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J ST LOUIS MO
— 314-882 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-885 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 MEHLVILLE MO
— 314-888 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LADUE MO
— 314-889 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-890 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-892 not yet reported which blocks → SOUTHWESTERN BELL 9533 MEHLVILLE MO
— 314-894 not yet reported which blocks → SOUTHWESTERN BELL 9533 MEHLVILLE MO
— 314-895 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-898 2XXX3XXX5XXX6XXX7XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 ST LOUIS MO
— 314-899 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 ST LOUIS MO
— 314-902 not yet reported which blocks → SPOK, INC. 6630 ST LOUIS MO
— 314-903 not yet reported which blocks → SPOK, INC. 6630 ST LOUIS MO
— 314-905 not yet reported which blocks → SPOK, INC. 6630 ST LOUIS MO
— 314-908 not yet reported which blocks → SPOK, INC. 6630 ST LOUIS MO
— 314-909 not yet reported which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD MO
— 314-910 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 314-913 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-914 2XXX3XXX4XXX5XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-915 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-917 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-918 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-919 5XXX6XXX7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-920 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-921 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO

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.