Spok, Inc. is a paging and hospital communications company that holds phone numbers for pagers.
Spok, Inc. is a paging and healthcare communications company that used to be called USA Mobility. Hospitals and other on-call teams use its pagers and messaging, and the phone numbers it holds are how calls and messages reach those pagers. NANPA, which runs the North American numbering plan, lists Spok as the holder of 1,941 prefixes in 38 states and territories, less than 1% of the 198,436 prefixes it has assigned.
- Name in NANPA's file
- SPOK, INC.
- What it is
- Paging network
- Prefixes held
- 1,941 of 198,436 (less than 1%)
- States and territories
- 38 of 56, most in California, New York and Texas
- Area codes
- 181
- Pooled prefixes
- None
From NANPA's central office code file of October 1, 2026. A prefix is the three digits after the area code.
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Enter the full number to see its carrier now, which may not be Spok if the number was ported. It is the same free check as our carrier lookup. To see whether it is a mobile, landline or VoIP line, use the line type lookup, and to see who it is listed to, the who called me lookup.
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A lookup shows Spok when the number reaches a pager or a paging service.
Calling a paging number usually sends a message or a callback number to someone's pager rather than ringing a phone.
Numbers can also move between carriers, so a lookup reads the number's carrier today, and a number with a Spok prefix can show another company if it was ported.
Spok holds the most prefixes in California: 244 of its 1,941.
- California244
- New York225
- Texas212
- Florida137
- Ohio116
- Illinois112
- Pennsylvania94
- Michigan92
Plus 709 prefixes in 30 more states and territories.
Spok holds prefixes in 181 area codes, and these are its largest.
A call that shows a paging carrier like Spok is unusual, but the carrier alone does not make it spam.
Paging numbers are mostly used to reach pagers, not to place calls.
Caller ID can be faked, so the call may not have come from a paging service at all.
Check the full number with our free spam phone checker before you call back.
You can read about 5 more carrier names here.
- American Messaging Services, LLCPaging network, 795 prefixes
- New Cingular Wireless PCS, LLCMobile network, 18,705 prefixes
- Onvoy, LLCSupplies numbers to VoIP and app-based phone services, 13,033 prefixes
- Peerless NetworkWholesale phone carrier, 1,265 prefixes
- Onvoy Spectrum, LLCSupplies numbers to VoIP and app-based phone services, 1,770 prefixes
These are the questions people ask about Spok.
What is Spok, Inc.?
Spok, Inc. is a paging and healthcare communications company that used to be called USA Mobility. Hospitals and other on-call teams use its pagers and messaging, and the phone numbers it holds are how calls and messages reach those pagers.
Why does a phone lookup say Spok?
A lookup shows Spok when the number reaches a pager or a paging service. Calling a paging number usually sends a message or a callback number to someone's pager rather than ringing a phone. Numbers can also move between carriers, so a lookup reads the number's carrier today, and a number with a Spok prefix can show another company if it was ported.
Is a call from a Spok number spam?
Paging numbers are mostly used to reach pagers, not to place calls. Caller ID can be faked, so the call may not have come from a paging service at all. Check the full number with our free spam phone checker before you call back.
How many phone prefixes does Spok hold?
NANPA lists Spok as the holder of 1,941 prefixes, less than 1% of all assigned US prefixes. A prefix is the three digits after the area code and covers up to 10,000 numbers. None of these are pooled, so each one is held whole.
Which states have the most Spok prefixes?
California (244), New York (225) and Texas (212) have the most, out of 38 states and territories.
Can I find out who owns a Spok number?
Spok does not publish who uses its numbers. Our free who called me lookup shows who a US number is listed to and the city and state on the listing, when the number has a listing.
Source: NANPA, the North American Numbering Plan Administrator: its central office code assignments, as of October 1, 2026. Company histories are from public records and each company's own descriptions.