NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 573-888 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
— 574-202 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GOSHEN IN
— 574-204 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → FBN INDIANA, INC. - IN 4117 SOUTH BEND IN
— 574-206 3XXX4XXX5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-208 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
— 574-209 4XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BREMEN IN
— 574-210 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
— 574-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.