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 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
— 314-842 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
— 314-843 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
— 314-844 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-845 4XXX which blocks → SOUTHWESTERN BELL 9533 MEHLVILLE MO
— 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
— 314-854 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-855 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-862 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
— 314-872 not yet reported which blocks → SOUTHWESTERN BELL 9533 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
— 314-889 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
— 314-909 not yet reported which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD 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
— 314-921 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-923 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-933 0XXX4XXX6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-935 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-951 4XXX8XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-953 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-957 5XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD MO
— 314-961 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-962 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-963 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-965 not yet reported which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD MO
— 314-966 not yet reported which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD MO
— 314-968 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-972 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-975 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX MO
— 314-977 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-982 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-983 8XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-984 not yet reported which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD MO
— 314-989 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-991 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-992 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS 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.