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 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
2002-06-06 573-452 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → FIDELITY CABLEVISION, LLC 3275 FTLENARDWD MO
2002-06-06 573-453 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FIDELITY CABLEVISION, LLC 3275 SALEM MO
2002-06-06 573-456 2XXX which blocks → FIDELITY CABLEVISION, LLC 3275 NEWBURG MO
2002-06-06 573-460 0XXX2XXX6XXX · 3 holders which blocks → FIDELITY CABLEVISION, LLC 3275 RICHLAND MO
2002-06-04 573-433 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 WAYNESVL MO
2002-05-15 573-287 0XXX1XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 PIEDMONT MO
2002-05-07 573-557 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 ELDON MO
2002-05-07 573-559 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 KENNETT MO
2002-05-07 573-560 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LOUISIANA MO
2002-05-07 573-567 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MEXICO MO
2002-05-07 573-569 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 VERSAILLES MO
2002-05-07 573-575 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CARUTHRSVL MO
2002-05-07 573-837 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CAPEGIRARD MO
2002-04-17 573-281 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MALDEN MO
2002-03-06 573-355 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 COLUMBIA MO
2002-01-07 573-586 0XXX3XXX4XXX6XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 FTLENARDWD MO
2001-10-29 573-746 2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LKOZKOSBCH MO
2001-10-23 573-677 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FIDELITY CABLEVISION, LLC 3356 CUBA MO
2001-10-23 573-679 0XXX3XXX4XXX7XXX · 3 holders which blocks → FIDELITY CABLEVISION, LLC 3356 BOURBON MO
2001-10-23 573-899 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FIDELITY CABLEVISION, LLC 3356 ST JAMES MO
2001-10-09 573-535 0XXX1XXX2XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 STEGNVIEVE MO
2001-10-08 573-541 6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HANNIBAL MO
2001-08-27 573-253 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEXICO MO
2001-08-20 573-544 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FULTON MO
2001-07-11 573-583 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 ORAN MO
2001-06-19 573-552 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LKOZKOSBCH MO
2001-06-15 573-561 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 FREDERCKTN MO
2001-06-15 573-629 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 HANNIBAL MO
2001-06-07 573-703 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIKESTON MO
2001-05-24 573-227 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MARSTON MO
2001-05-24 573-232 1XXX2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 ST ROBERT MO
2001-05-24 573-233 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CHARLESTON MO
2001-05-24 573-367 0XXX2XXX3XXX4XXX5XXX · 3 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 SAFE MO
2001-05-24 573-612 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 ROLLA MO
2001-05-24 573-714 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POPLAR BLF MO
2001-05-24 573-715 1XXX7XXX · 2 holders which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 SALEM MO
2001-05-24 573-758 0XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 GRANDIN MO
2001-05-22 573-397 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
2001-05-01 573-783 none assigned yet which blocks → SOUTHWESTERN BELL 9533 FREDERCKTN MO
2001-02-12 573-826 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FULTON MO
2001-01-10 573-721 7XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - MO 6275 MEXICO MO
— 573-204 3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 JACKSON MO
— 573-209 not yet reported which blocks → MARK TWAIN COMMUNICATIONS 8953 EWING MO
— 573-210 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 POTOSI MO
— 573-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-212 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ORAN MO
— 573-214 1XXX which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-215 not yet reported which blocks → MARK TWAIN COMMUNICATIONS 8953 LEWISTOWN MO
— 573-216 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LKOZKOSBCH MO
— 573-218 0XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FARMINGTON 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.