Comcast proxies — AS7922 residential cable exits across the US

What Comcast is, and is not

Comcast Cable Communications (AS7922) is the residential broadband ISP — Xfinity-branded cable and fiber service. It's a separate operational entity from Comcast / NBCUniversal (the media business) and from Comcast Business (which has its own ASN set). When a target site reads "AS7922" on a reverse lookup, they see residential cable.

Comcast is the largest US cable ISP by subscribers — approximately 32M residential broadband connections per 2024 reporting, with an estimated customer base heavily weighted toward dense urban Northeast and Mid-Atlantic markets plus Chicago metro and scattered West Coast footprints.

The AS7922 footprint

AS7922 peers with 240+ networks globally and runs upstream connectivity through multiple Tier-1 transits. Comcast's AS7922 announcement inventory covers 12 million+ IPv4 addresses and 140+ IPv4 prefixes. The peering density matters: Comcast is one of the few US residential ISPs that sits inside the major peering fabrics as a first-class participant, which means traffic from a Comcast residential exit to a Cloudflare-fronted or AWS-hosted target clears in single- digit milliseconds.

Comcast geography:

• Pennsylvania: Home state (Philadelphia HQ). Densest metro coverage; the Comcast Center and Technology Center are the corporate core.
• Illinois: Chicago is Comcast's third- largest market by subscribers.
• Massachusetts: Boston metro is heavily Comcast cable with Verizon Fios as competition.
• Michigan: Detroit-metro dominant cable ISP.
• Maryland + the DC suburbs, NoVA exterior: significant Comcast footprint (competing with Cox and Verizon Fios in different zones).

Secondary but notable Comcast markets: Colorado (Denver metro), Georgia (Atlanta suburbs), Florida (Jacksonville and parts of the Gulf), Tennessee (Nashville), Oregon / Washington (Seattle-Tacoma, Portland). Comcast does not serve most of Texas, most of California outside Bay Area / Sacramento, most of the Carolinas, most of the Upper Midwest outside Chicago, most of Florida outside Jacksonville and the Gulf Coast. A "Comcast" rotation that claims Houston or Charlotte coverage is almost certainly not real Comcast.

How Comcast fingerprints at targets

Comcast is the most common "residential cable" carrier in the US and most integrity stacks weight AS7922 as their canonical "residential home broadband" baseline. That's useful when the trust signal you want is "this is an ordinary US cable customer" — it's the common case.

A few caveats:

• Comcast's dynamic DHCP allocation cycles public IPs every few hours in most markets. A scrape that holds the same Comcast IP for 12+ hours looks less-human than one that rotates at a normal cadence. Proxaro's residential sticky maxes at 60 min for this reason.
• Comcast Business allocations are on a separate ASN and read as "Comcast Business" on detailed lookups. Our residential pool excludes business prefixes.
• FCC CAF-II and RDOF-funded Comcast expansion areas in rural PA, WV and VA carry a specific sub-allocation pattern that some fraud stacks flag. We don't route traffic through those rural sub-pools.

When Comcast is the right pick

• Any US-residential baseline rotation where you want the statistically common cable trust signal
• Northeast-corridor targets (Philly, Boston, DC) where Comcast is the default consumer ISP
• Chicago and Mid-Atlantic retail and ad verification
• Workflows where the sticky session needs to persist through a clean customer-like IP lifecycle

Related: Xfinity Mobile

Comcast also operates Xfinity Mobile — an MVNO on Verizon's network with a small allocation of Comcast-branded mobile IPs. Xfinity Mobile is a separate trust-signal category and announces through Verizon's AS22394 with Xfinity Mobile sub-allocation tags. Not included in the standard Comcast residential pool.

Pricing and pool access

Comcast AS7922 ASN pinning is available on Carrier and above. Recommended starting state pools: Pennsylvania, Illinois, Massachusetts, Michigan, Maryland.

References

• Comcast 2024 Annual Report: residential broadband subscriber count
• peeringdb.com — AS7922 Comcast Cable Communications
• CAIDA AS Rank: AS7922 peering and customer cone data
• bgp.tools AS7922 — prefix inventory
• Leichtman Research Group: 2024 US broadband subscriber tracking