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

SEASIDE prefixes in area code 910

NANPA records 3 assigned NXX blocks to rate center SEASIDE in area code 910, 0.4% of the 785 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. 2 holders hold those blocks, the largest being ATLANTIC TEL. MEMBERSHIP CORP. (2), METROPCS, INC. (1). The earliest assignment on record here is 2002-06-07 and the most recent 2002-06-07. 1 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 codes 503, 971 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 910
2 holders of record
1 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
910-393 T-Mobile METROPCS, INC. 2002-06-07 yes yes
910-575 ATLANTIC TEL. MEMBERSHIP CORP. – no yes
910-579 ATLANTIC TEL. MEMBERSHIP CORP. – no 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
ATLANTIC TEL. MEMBERSHIP CORP. – 2 66.7%
METROPCS, INC. T-Mobile 1 33.3%

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 SEASIDE in area code 910?

3 blocks: 393, 575, 579. The table above gives the holder of each.

Which carriers have numbers in SEASIDE?

ATLANTIC TEL. MEMBERSHIP CORP. (2 blocks), METROPCS, INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SEASIDE 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 910

All 785 prefixes in 910