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 573
SOUTHWESTERN BELL 128
NEW CINGULAR WIRELESS PCS, LLC - IL 113
ONVOY, LLC - MO 86
LEVEL 3 COMMUNICATIONS, LLC - MO 63
T-MOBILE USA, INC. 44
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
— 573-881 none assigned yet which blocks → UNITED STATES CELLULAR - MO 6275 COLUMBIA MO
— 573-882 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-883 none assigned yet which blocks → SOUTHWESTERN BELL 9533 STEGNVIEVE MO
— 573-884 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-885 5XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 CUBA MO
— 573-886 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-887 0XXX2XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CHAFFEE MO
— 573-888 none assigned yet which blocks → SOUTHWESTERN BELL 9533 KENNETT MO
— 573-892 0XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MO 093F FREMONT MO
— 573-893 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-894 0XXX4XXX6XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SHELBYVL MO
— 573-895 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J BLOOMFIELD MO
— 573-896 1XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-897 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LINN MO
— 573-898 0XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ELSBERRY MO
— 573-901 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MO 093F MALDEN MO
— 573-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-919 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E KENNETT MO
— 573-921 0XXX2XXX3XXX · 2 holders which blocks → ONVOY, LLC - MO 093F EWING MO
— 573-922 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARUTHRSVL MO
— 573-924 not yet reported which blocks → ELLINGTON TEL. CO. 1874 SWEETWATER MO
— 573-925 0XXX1XXX2XXX · 3 holders which blocks → ONVOY, LLC - MO 093F CENTERVL MO
— 573-927 7XXX which blocks → FIDELITY TELEPHONE, LLC 1882 STANTON MO
— 573-928 2XXX3XXX4XXX7XXX · 2 holders which blocks → ONVOY, LLC - MO 093F MONTAUK MO
— 573-929 1XXX which blocks → WINDSTREAM MISSOURI, INC. 1885 BELLFLOWER MO
— 573-931 2XXX6XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SIKESTON MO
— 573-933 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA MO
— 573-934 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 FREDERCKTN MO
— 573-938 0XXX which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E STOUTSVL MO
— 573-942 1XXX2XXX · 2 holders which blocks → ONVOY, LLC - MO 093F SANTA FE MO
— 573-943 0XXX1XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 MTSTERLING MO
— 573-945 not yet reported which blocks → ELLINGTON TEL. CO. 1874 GARWOOD MO
— 573-949 0XXX2XXX3XXX9XXX · 2 holders which blocks → ONVOY, LLC - MO 093F HALLSVILLE MO
— 573-950 not yet reported which blocks → MO
— 573-958 not yet reported which blocks → MO
— 573-959 not yet reported which blocks → MO
— 573-964 0XXX1XXX4XXX7XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 LKOZKOSBCH MO
— 573-967 0XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FISK MO
— 573-970 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NUSO, LLC 732J COLUMBIA MO
— 573-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-979 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CAPEGIRARD MO
— 573-983 3XXX4XXX5XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 HUNNEWELL MO
— 573-985 1XXX2XXX6XXX · 2 holders which blocks → NEW FLORENCE TEL. CO., INC. 1927 NEW LONDON MO
— 573-986 0XXX which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-989 8XXX9XXX · 2 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 NEELYVILLE MO
— 573-992 0XXX2XXX3XXX4XXX5XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J MORRISON MO
— 573-994 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MO 093F ANNAPOLIS MO
— 573-996 none assigned yet which blocks → WINDSTREAM MISSOURI, INC. 1885 DONIPHAN MO
— 573-998 1XXX6XXX8XXX · 3 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 WILLIAMSVL MO
— 573-999 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO

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.