Comcast phone number blocks and OCNs in the US

Comcast holds 24.4 million phone numbers in the United States, 1.3% of the numbers NANPA’s table of 2026-09-27 lists as allocated there, under 3 operating company numbers (OCNs); the largest, COMCAST IP PHONE, LLC (OCN 318J), holds 22.1 million. The carrier a phone lookup names for a number is the holder of the block the number sits in, as the regulator lists it: the original allocation, not the caller, the app or the network that serves a ported number today.

Brand	Comcast
Numbers held	24,442,000 (1.3% of the allocated numbers in NANPA’s table)
Operating company numbers	3
Codes held	2,068
Thousands-blocks held	22,760
Table	NANPA numbering reports, file dated 2026-09-27
Terms	no terms of use published (NANPA)
Grouped by	Spaw’s carrier brand map of 2026-09-24
Region	United States

The legal entities NANPA lists

Every holder in NANPA’s table that the brand map groups under Comcast, by the numbers allocated to it and with its operating company number (OCN), the code the table identifies a carrier by. Names are printed as the regulator writes them. Holdings are counted in numbers, not table rows, because rows differ in size: a central office code (NPA-NXX) is 10,000 numbers and a thousands-block 1,000. A pooled code counts for its code holder only where no thousands-block row of the table covers it, so no number is counted twice.

holder	ocn	codes	thousands-blocks	numbers	read as
COMCAST IP PHONE, LLC	318J	1,856	20,646	22,141,000	unsettled
COMCAST PHONE OF CALIFORNIA, LLC	394L	209	2,112	2,279,000	unsettled
COMCAST PHONE OF TEXAS, LLC - TX	8625	3	2	22,000	unsettled

How a lookup reads these numbers

The North American plan leaves a number’s line type to the holder of its block, so a lookup reads it from the holder: 0.0% of Comcast’s numbers read as VoIP, 0.0% as mobile, and for 100.0% the holder settles neither, so the line type stays fixed_line_or_mobile.

The reading is Spaw’s classification of each holder: the holder’s regulatory filing (in the US its FCC Form 499 filing type) and its own description, matched on the name the regulator’s table gives it. It is a lower bound, not a measurement of the numbers, and it says what a lookup answers, not what Comcast is.

The area codes with most of its numbers

Comcast’s entities hold numbers under 296 area codes. The share is its part of the numbers NANPA lists as allocated under each code.

code	place	numbers	share of the code
757	Norfolk, VA	637,000	8.1%
717	Pennsylvania	376,000	4.8%
443	Maryland	360,000	4.6%
405	Oklahoma	358,000	4.7%
702	Las Vegas, NV	336,000	4.3%
480	Phoenix, AZ	315,000	4.0%
619	California	303,000	3.9%
603	New Hampshire	296,000	4.3%
540	Virginia	277,000	3.6%
720	Denver, CO	273,000	3.5%
949	California	273,000	3.7%
978	Massachusetts	267,000	3.5%

Thousands-blocks in pooled codes

In a pooled US code NANPA assigns the code’s ten thousands-blocks one by one, often to carriers other than the code holder, and a lookup names the holder of the number’s own thousands-block where NANPA lists one. Comcast’s entities hold 22,760 thousands-blocks: 5,696 inside codes its own entities hold, 15,303 inside codes of other brands and 1,761 inside codes of holders the brand map does not group, which this page counts but does not name.

code holder’s brand	Comcast’s blocks inside
AT&T	3,562
Verizon	3,139
Lumen	2,511
T-Mobile	1,752
Windstream	1,310
Inteliquent	1,241

Other holders hold 12,086 thousands-blocks inside Comcast’s codes, 824 of them holders the brand map does not group. The largest: Inteliquent 2,654, T-Mobile 1,908, Verizon 1,675, AT&T 1,661, Bandwidth 1,352, Lumen 943.

Assignments by year

The codes and thousands-blocks the table still lists under Comcast’s entities, by the year NANPA dates their assignment. A block returned since is no longer in the table, so earlier years read low; 90.1% of the rows carry a date. NANPA dates nothing before 2001 and no retained block.

year	codes	thousands-blocks	numbers
2026	4	41	41,000
2025	2	118	118,000
2024	11	129	129,000
2023	98	609	611,000
2022	50	481	484,000
2021	34	317	318,000
2020	37	624	625,000
2019	29	554	556,000
2018	27	665	666,000
2017	65	959	962,000
1998–2016	798	16,709	17.5 million

What this page cannot say

A regulator’s table records the original allocation of each block, never who serves a number today: a number ported away from Comcast keeps its block, and a lookup still names the block’s holder for it.
The carrier a lookup names is not the caller, the app or the subscriber. Caller ID can be spoofed, so the holder of a calling number’s block may not have carried the call at all.
Spaw does no reverse lookup and names no subscriber: nothing here says who owns or uses any number.
Shares are shares of the regulator’s own table, not of subscribers, lines in service or traffic.
In a pooled US code a lookup names the holder of the number’s own thousands-block where NANPA lists one, otherwise the code holder; Canada’s table is code-level.
The grouping under Comcast is Spaw’s carrier brand map of 2026-09-24: legal entities, subsidiaries and former names under the brand the network trades as today. Networks change hands, and the map is reviewed at least yearly.

Comcast and the other brand names on this page are trademarks of their owners, used only to name the networks the regulators’ tables list. Spaw is not affiliated with any of them.

Other carriers in the United States

NANPA numbering reports file dated 2026-09-27 · carrier brand map 2026-09-24 · page changed 2026-09-27

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