Your IP's network — its ASN — carries a reputation score that decides your fate before the first request. Here's what the score is and why datacenter ranges lose.
An ASN is the network that announces your IP. Anti-bot systems score each ASN (often 0-100) by how much abuse comes from it. Hosting/datacenter ASNs score low and are blocked by default — there are no real subscribers to protect. Mobile carrier ASNs score high because blocking them would hit paying customers behind CGNAT. Your proxy inherits its ASN's score instantly, which is why a clean fingerprint on a datacenter ASN still fails.
Every public IP is announced by an Autonomous System. A reverse lookup turns your IP into an ASN and an organisation name (e.g. "AS14061 DigitalOcean" or "AS21928 T-Mobile USA") in milliseconds. Detectors keep a reputation table keyed by ASN, so the moment they resolve yours they already know how much to trust you — before headers, TLS, or behavior enter the picture.
That's the uncomfortable truth for datacenter proxies: the ASN is a label you can't hide. You can spoof a User-Agent, but you can't make AS14061 announce as a phone network.
| Signal | Effect on score |
|---|---|
| ASN is a known hosting/cloud provider | Strong penalty |
| High historical bot/spam/fraud volume | Penalty |
| Listed on DNSBLs / fraud feeds | Penalty |
| Residential ISP ASN with mixed traffic | Neutral-positive |
| Mobile carrier ASN (CGNAT, real subscribers) | Strong boost |
Exact formulas are proprietary and vary by vendor (IPQualityScore, ipinfo, and in-house systems). The directional logic above is consistent across them.
An ASN (Autonomous System Number) identifies the network that announces a block of IP addresses to the internet. Every IP belongs to one. AWS, OVH, Hetzner and DigitalOcean each have hosting ASNs; T-Mobile, Vodafone and Orange have mobile carrier ASNs. Anti-bot systems map your IP to its ASN in a single lookup and judge it accordingly.
Detectors aggregate how much automated abuse, spam, and fraud historically originates from each ASN, often expressed as a 0-100 score. A hosting ASN that emits mostly bot traffic earns a low score; a mobile carrier ASN carrying mostly real human traffic earns a high one. The score is applied to every IP on that ASN before any request-level analysis.
Because their ASN gives them away instantly and there is no collateral cost to blocking them. A hosting ASN has no real consumer subscribers, so a site can block the entire range with near-zero risk of hurting genuine users. Mobile carrier ASNs are the opposite: blocking them risks blocking paying customers, so detectors are cautious.
ASN is one input to the bigger picture in the IP reputation guide. See also subnet cleanliness and the success-rate data by IP type.
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