NumberResearchRecent prefix assignments
371 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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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Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 773-206 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL | |
| 773-208 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL | |
| 773-209 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-210 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL | |
| 773-211 | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | IL | |
| 773-212 | SPOK, INC. | 6630 | CHICGOZN03 | IL | |
| 773-213 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL | |
| 773-214 | SPOK, INC. | 6630 | CHICGOZN01 | IL | |
| 773-215 | SPOK, INC. | 6630 | CHICGOZN01 | IL | |
| 773-216 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-218 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL | |
| 773-219 | T-MOBILE USA, INC. | 6529 | CHICGOZN07 | IL | |
| 773-220 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-221 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL | |
| 773-222 | SPOK, INC. | 6630 | CHICGOZN01 | IL | |
| 773-223 | SPOK, INC. | 6630 | CHICGOZN06 | IL | |
| 773-224 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-227 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL | |
| 773-228 | SPOK, INC. | 6630 | CHICGOZN01 | IL | |
| 773-229 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN08 | IL | |
| 773-230 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN03 | IL | |
| 773-233 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL | |
| 773-235 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL | |
| 773-237 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN05 | IL | |
| 773-238 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL | |
| 773-239 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL | |
| 773-241 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-242 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL | |
| 773-243 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN03 | IL | |
| 773-244 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL | |
| 773-246 | INDIANA PAGING NETWORK, INC. | 6795 | CHICGOZN04 | IL | |
| 773-247 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL | |
| 773-248 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL | |
| 773-249 | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN11 | IL | |
| 773-250 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN02 | IL | |
| 773-251 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN03 | IL | |
| 773-252 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL | |
| 773-253 | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN10 | IL | |
| 773-254 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL | |
| 773-255 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN03 | IL | |
| 773-256 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-257 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL | |
| 773-258 | SPOK, INC. | 6630 | CHICGOZN01 | IL | |
| 773-259 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL | |
| 773-260 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL | |
| 773-261 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN05 | IL | |
| 773-262 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL | |
| 773-263 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-264 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL | |
| 773-265 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
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.