Why US retail anti-bot treats Comcast different from Spectrum

The observation

If you run enough rotation through both Comcast (AS7922) and Spectrum (AS20115 + AS11427) against major US retail fraud stacks — Kount, Sift, Riskified, Forter, Signifyd, and the stacks Shopify and Amazon run in-house — you'll notice that checkout friction, risk-score distributions, and cookie-challenge rates differ between the two ASNs in ways that aren't explained by "both are residential cable ISPs."

Specifically: Comcast tends to score ~4–8% higher baseline trust on most US retail fraud stacks than Spectrum does. Not a huge gap, but consistent enough across categories that operators have noticed. This post is the best explanation we have for why.

It's not about trust-laundering

The easy assumption is that Spectrum pools on the proxy market are more polluted with rebrokered allocations than Comcast pools. That's sometimes true — Spectrum has wider geographic coverage (27 states), which means more tier-2 reseller activity and more opportunities for stale announcements. But it doesn't explain the pattern at the ASN level on clean exits.

It's partly about the ASN duality

Spectrum operates two major ASNs:

• AS20115 — Charter's original ASN, announced from the legacy Charter network.
• AS11427 — legacy Time Warner Cable's ASN, still in use across NYC, LA, and the Carolinas.

Most integrity stacks trained on pre-2016 data treat AS11427 and AS20115 as separate signals. The 2016 Charter/TWC/Bright House merger consolidated the business, but the fraud-stack training data didn't consolidate overnight — and in some cases, never fully did. AS11427 IPs sometimes carry a distinct residual signal from their TWC history, particularly in NYC, LA, and North Carolina.

Comcast has a single-ASN legacy (AS7922) with consistent training signal going back to the late 1990s. Less noise, less ambiguity.

It's partly about Northeast concentration

Retail fraud-stack training data is biased toward the markets that run the most transactions. The Northeast, Mid-Atlantic, and Chicago metros (where Comcast dominates) over-index on US e-commerce spend per capita. That means the typical AS7922 subscriber in the training data is statistically a higher-LTV, lower-risk profile than the typical AS20115 subscriber, because the geographic distribution of Comcast subscribers skews toward wealth-concentrated metros.

Spectrum's coverage — Texas, Southeast, Carolinas, parts of California — covers a more demographically diverse base, including large regions with lower average transaction values and higher fraud rates historically. That historical data shows up in the baseline trust score for Spectrum AS20115 IPs.

This is not a judgment — it's a statistical observation about the training data's geographic bias, carried forward as an ASN-level prior even for clean exits.

It's partly about peering density

Comcast AS7922 peers with 240+ networks globally as a first-class peering participant at every major US peering fabric. Spectrum's peering is competitive but a step behind — AS20115 peers at fewer facilities and at lower ratios. For any target that correlates "ASN peering graph density" with "statistically-common residential trust," Comcast's denser peering graph pulls its baseline trust up.

You can see this at play in the BGP-graph-aware fraud stacks (Spur, IPQualityScore, and the newer adversarial-ML fraud models). These tools explicitly ingest peering data and weight carriers whose peering looks "backbone-ish" (many Tier-1 peers, low customer-cone depth) differently from carriers whose peering looks "regional-ish."

What this means operationally

For most retail workloads, the 4–8% baseline trust gap between Comcast and Spectrum doesn't matter. Both clear 99%+ of typical Shopify / Amazon / Etsy checkout flows without friction. The gap shows up at the margins:

• High-friction checkout categories — tickets, high-dollar electronics, firearms, regulated goods. Here, the 4-8% matters and Comcast outperforms Spectrum on first-attempt-success rate.
• Account warming / long-session work — the per-session risk score compounds over time. A Spectrum-rotated warming account accumulates a marginally higher risk score over 30 days than a Comcast-rotated one, all else equal.
• Cross-ASN anomaly detection — if your rotation hops between ASN classes (mobile, then Comcast, then Spectrum), the transition signals matter. Integrity stacks weight Spectrum→Comcast transitions as more-normal-than Spectrum→mobile transitions, but both register.

The practical takeaway: for retail workloads where the marginal trust score matters, Comcast is the first pick. Spectrum is the right pick when Comcast doesn't serve the geography you need (Texas, Carolinas, Florida outside the Jacksonville / Tampa cluster, LA).

Where the pattern reverses

In a few categories, Spectrum out-performs Comcast:

• Texas retail — Comcast doesn't serve Texas at residential scale. A "Texas residential Comcast" claim is suspect; Spectrum is the honest signal for Texas residential.
• LA basin retail — AS11427 (TWC-legacy) carries LA subscribers and is the statistically-expected LA-metro signal. Comcast's LA footprint is thin.
• Carolinas retail — Spectrum is effectively the only cable ISP for Charlotte, Raleigh, and most of NC's metros. Carolina-specific retail expects Spectrum.

So "Comcast > Spectrum" is a North / Midwest / Northeast rule. In the South and California outside SF, Spectrum is the more-honest signal.

The Cox, CenturyLink, Frontier rule

For completeness: Cox (AS22773) is the third- largest US cable ISP but concentrated in Phoenix, San Diego, and Norfolk. In those metros, Cox is the statistically-expected residential signal and outperforms either Comcast or Spectrum (neither of whom serve those markets at scale). In Cox-territory, use Cox.

Similarly, CenturyLink / Lumen (AS209) is the right pick for Mountain West residential (Denver, Salt Lake, parts of Phoenix) where the big-two cable operators have thin presence, and Frontier (AS5650) for California Central Valley and Connecticut fiber.

A quick decision matrix

Target category	Best residential carrier
Northeast / Mid-Atlantic retail	Comcast
NYC metro retail	Spectrum AS11427 (TWC-legacy)
Texas retail	Spectrum AS20115
California retail (LA basin)	Spectrum AS11427
California retail (Bay Area)	Comcast AS7922
Florida retail	Spectrum (varies; Comcast in Jax)
Carolinas retail	Spectrum
Phoenix / San Diego retail	Cox
Chicago metro retail	Comcast
Connecticut retail	Frontier
Denver / Mountain West retail	CenturyLink or Comcast

References and further reading

• Cloudflare Radar ASN profiles (AS7922, AS20115, AS11427) — peering graph visualizations
• Spur.us IP context API — per-ASN risk profile data
• IPQualityScore ASN profile endpoints
• Kount and Sift public industry-panel research on ASN scoring

For deep dives on individual carriers, see our carrier index.