NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

SNMN SNMN prefixes in area code 310

NANPA records 84 assigned NXX blocks to rate center SNMN SNMN in area code 310, 10.7% of the 786 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 15 holders hold those blocks, the largest being FRONTIER CALIFORNIA INC. (39), SPOK, INC. (10), METROPCS NETWORKS, LLC (7). The earliest assignment on record here is 2001-04-19 and the most recent 2006-11-07. 32 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area code 424 – overlay codes cover the same geography, so a rate center is served by all of them.

84 assigned blocks – 10.7% of 310
15 holders of record
32 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
310-230 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-232 Spok SPOK, INC. – no yes
310-236 Spok SPOK, INC. – no yes
310-238 Spok SPOK, INC. – no yes
310-239 Spok SPOK, INC. – no yes
310-255 AT&T PACIFIC BELL (COMPETITIVE) – no yes
310-260 Frontier FRONTIER CALIFORNIA INC. – no yes
310-261 T-Mobile METROPCS NETWORKS, LLC – yes yes
310-262 Spok SPOK, INC. – no yes
310-264 Frontier FRONTIER CALIFORNIA INC. – no yes
310-266 AT&T NEW CINGULAR WIRELESS PCS, LLC – no yes
310-267 Frontier FRONTIER CALIFORNIA INC. – no yes
310-309 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA – yes yes
310-310 T-Mobile T-MOBILE USA, INC. 2006-11-07 yes yes
310-314 Frontier FRONTIER CALIFORNIA INC. – no yes
310-315 Frontier FRONTIER CALIFORNIA INC. – no yes
310-319 Frontier FRONTIER CALIFORNIA INC. – no yes
310-382 Lumen LEVEL 3 TELECOM OF CALIFORNIA, LP - CA – yes yes
310-392 Frontier FRONTIER CALIFORNIA INC. – no yes
310-393 Frontier FRONTIER CALIFORNIA INC. – no yes
310-394 Frontier FRONTIER CALIFORNIA INC. – no yes
310-395 Frontier FRONTIER CALIFORNIA INC. – no yes
310-396 Frontier FRONTIER CALIFORNIA INC. – no yes
310-399 Frontier FRONTIER CALIFORNIA INC. – no yes
310-401 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
310-403 T-Mobile METROPCS NETWORKS, LLC – yes yes
310-420 T-Mobile METROPCS NETWORKS, LLC – yes yes
310-428 T-Mobile METROPCS NETWORKS, LLC – yes yes
310-430 T-Mobile T-MOBILE USA, INC. 2002-09-06 yes yes
310-434 Frontier FRONTIER CALIFORNIA INC. – no yes
310-449 Frontier FRONTIER CALIFORNIA INC. – no yes
310-450 Frontier FRONTIER CALIFORNIA INC. – no yes
310-451 Frontier FRONTIER CALIFORNIA INC. – no yes
310-452 Frontier FRONTIER CALIFORNIA INC. – no yes
310-453 Frontier FRONTIER CALIFORNIA INC. – no yes
310-454 Frontier FRONTIER CALIFORNIA INC. – no yes
310-455 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-458 Frontier FRONTIER CALIFORNIA INC. – no yes
310-459 Frontier FRONTIER CALIFORNIA INC. – no yes
310-460 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
310-463 AT&T NEW CINGULAR WIRELESS PCS, LLC – no yes
310-466 T-Mobile METROPCS NETWORKS, LLC – yes yes
310-496 Onvoy ONVOY, LLC - CA – yes yes
310-526 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA – yes yes
310-564 Onvoy ONVOY, LLC - CA – yes yes
310-566 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS – no yes
310-570 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-573 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-576 Frontier FRONTIER CALIFORNIA INC. – no yes
310-580 UTILITY TELECOM GROUP, LLC - CA – no yes
310-581 Frontier FRONTIER CALIFORNIA INC. – no yes
310-582 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-583 33 WIRELESS INC. – no yes
310-584 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-585 Spok SPOK, INC. – no yes
310-586 Frontier FRONTIER CALIFORNIA INC. – no yes
310-587 Frontier FRONTIER CALIFORNIA INC. – no yes
310-588 Spok SPOK, INC. – no yes
310-593 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
310-628 T-Mobile T-MOBILE USA, INC. – yes yes
310-633 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA – yes yes
310-656 Frontier FRONTIER CALIFORNIA INC. – no yes
310-663 T-Mobile METROPCS NETWORKS, LLC – yes yes
310-664 Frontier FRONTIER CALIFORNIA INC. – no yes
310-699 AT&T NEW CINGULAR WIRELESS PCS, LLC 2001-10-18 no yes
310-752 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA – yes yes
310-790 Spok SPOK, INC. – no yes
310-795 AT&T NEW CINGULAR WIRELESS PCS, LLC 2001-04-19 no yes
310-804 AT&T NEW CINGULAR WIRELESS PCS, LLC – no yes
310-828 Frontier FRONTIER CALIFORNIA INC. – no yes
310-829 Frontier FRONTIER CALIFORNIA INC. – no yes
310-857 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS – yes yes
310-865 AT&T PACIFIC BELL (COMPETITIVE) – no yes
310-866 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-875 Spok SPOK, INC. – no yes
310-877 T-Mobile METROPCS NETWORKS, LLC – yes yes
310-883 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS – yes yes
310-899 Frontier FRONTIER CALIFORNIA INC. – no yes
310-907 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
310-917 Frontier FRONTIER CALIFORNIA INC. – no yes
310-980 T-Mobile T-MOBILE USA, INC. 2002-02-21 no yes
310-985 T-Mobile T-MOBILE USA, INC. 2002-10-17 yes yes
310-992 Spok SPOK, INC. – no yes
310-998 Frontier FRONTIER CALIFORNIA INC. – yes yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
FRONTIER CALIFORNIA INC. Frontier 39 46.4%
SPOK, INC. Spok 10 11.9%
METROPCS NETWORKS, LLC T-Mobile 7 8.3%
NEW CINGULAR WIRELESS PCS, LLC AT&T 5 6%
T-MOBILE USA, INC. T-Mobile 5 6%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 3 3.6%
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS TPx 3 3.6%
PACIFIC BELL (COMPETITIVE) AT&T 2 2.4%
TELEPORT COMMUNICATIONS AMERICA, LLC - CA AT&T 2 2.4%
ONVOY, LLC - CA Onvoy 2 2.4%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA Verizon 2 2.4%
LEVEL 3 TELECOM OF CALIFORNIA, LP - CA Lumen 1 1.2%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 1.2%
UTILITY TELECOM GROUP, LLC - CA – 1 1.2%
33 WIRELESS INC. – 1 1.2%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to SNMN SNMN in area code 310?

84 blocks: 230, 232, 236, 238, 239, 255, 260, 261, 262, 264, 266, 267 and 72 more, all listed in the table above.

Which carriers have numbers in SNMN SNMN?

FRONTIER CALIFORNIA INC. (39 blocks), SPOK, INC. (10 blocks), METROPCS NETWORKS, LLC (7 blocks), NEW CINGULAR WIRELESS PCS, LLC (5 blocks), T-MOBILE USA, INC. (5 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (3 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SNMN SNMN a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 310

All 786 prefixes in 310