NumberResearchRecent prefix assignments
369 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/18/2026
Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.
Most active assignees, last 30 days
New assignments by month
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| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 313-897 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-898 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-899 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-903 | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI | |
| 313-908 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DETROITZN6 | MI | |
| 313-909 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DETROITZN5 | MI | |
| 313-910 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DETROITZN5 | MI | |
| 313-911 | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MI | |
| 313-912 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DETROITZN5 | MI | |
| 313-914 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DETROITZN6 | MI | |
| 313-915 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | DETROITZN4 | MI | |
| 313-916 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-917 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DETROITZN5 | MI | |
| 313-919 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DETROITZN5 | MI | |
| 313-920 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DETROITZN5 | MI | |
| 313-921 | MICHIGAN BELL TEL CO | 9323 | DETROITZN2 | MI | |
| 313-922 | MICHIGAN BELL TEL CO | 9323 | DETROITZN2 | MI | |
| 313-923 | MICHIGAN BELL TEL CO | 9323 | DETROITZN2 | MI | |
| 313-924 | MICHIGAN BELL TEL CO | 9323 | DETROITZN2 | MI | |
| 313-925 | MICHIGAN BELL TEL CO | 9323 | DETROITZN2 | MI | |
| 313-926 | MICHIGAN BELL TEL CO | 9323 | DETROITZN2 | MI | |
| 313-927 | MICHIGAN BELL TEL CO | 9323 | DETROITZN4 | MI | |
| 313-928 | MICHIGAN BELL TEL CO | 9323 | DETROITZN6 | MI | |
| 313-929 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DETROITZN5 | MI | |
| 313-931 | MICHIGAN BELL TEL CO | 9323 | DETROITZN4 | MI | |
| 313-933 | MICHIGAN BELL TEL CO | 9323 | DETROITZN4 | MI | |
| 313-934 | MICHIGAN BELL TEL CO | 9323 | DETROITZN4 | MI | |
| 313-935 | MICHIGAN BELL TEL CO | 9323 | DETROITZN4 | MI | |
| 313-937 | MICHIGAN BELL TEL CO | 9323 | DETROITZN5 | MI | |
| 313-938 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DETROITZN5 | MI | |
| 313-940 | SPOK, INC. | 6630 | DETROITZN5 | MI | |
| 313-943 | MICHIGAN BELL TEL CO | 9323 | DETROITZN6 | MI | |
| 313-945 | MICHIGAN BELL TEL CO | 9323 | DETROITZN6 | MI | |
| 313-948 | METROPCS, INC. | 5562 | DETROITZN5 | MI | |
| 313-949 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DETROITZN5 | MI | |
| 313-950 | MI | ||||
| 313-952 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | DETROITZN5 | MI | |
| 313-956 | MICHIGAN BELL TEL CO | 9323 | DETROITZN3 | MI | |
| 313-957 | MICHIGAN BELL TEL CO | 9323 | DETROITZN3 | MI | |
| 313-958 | SPOK, INC. | 6630 | DETROITZN5 | MI | |
| 313-959 | MI | ||||
| 313-961 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-962 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-963 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-964 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-965 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-966 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-967 | MICHIGAN BELL TEL CO | 9323 | DETROITZN1 | MI | |
| 313-969 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | DETROITZN5 | MI | |
| 313-970 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DETROITZN5 | MI |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.