← Glossary / ASN Targeting

What is ASN Targeting?

ASN targeting is the practice of routing scraping traffic exclusively through specific Autonomous System Numbers (ASNs) to bypass anti-bot filters that profile IP ownership. Instead of randomly selecting residential proxies, pipelines target high-trust consumer ISPs or specific mobile carriers to blend in with legitimate user traffic. It's the difference between looking like a generic cloud server and looking like a real mobile device on a specific local network.

IP ProxiesTraffic RoutingBGPISP TrustAnti-bot Bypass
// 02 — definitions

Routing by
network trust.

Why the network your IP belongs to matters more than the IP itself when bypassing modern bot classifiers.

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TL;DR

ASN targeting restricts proxy selection to specific internet service providers or mobile carriers. It's essential for scraping targets that block known datacenter ASNs (like AWS or DigitalOcean) or flag traffic from low-tier proxy providers. By targeting high-reputation ASNs, scrapers inherit the trust score of legitimate residential users.

01Definition & structure
An Autonomous System Number (ASN) identifies a specific network on the internet. ASN targeting allows a scraper to request an IP address that belongs to a specific ISP (e.g., Comcast, Vodafone) rather than accepting any random IP from a proxy provider's pool. This is crucial because anti-bot systems heavily weight the ASN's reputation when calculating a request's trust score.
02How it works in practice
When configuring a proxy request, the scraper appends the desired ASN to the proxy authentication string (e.g., user-username-asn_7922:password). The proxy gateway intercepts this, filters its available IP pool for addresses belonging to ASN 7922, and routes the request through one of them. If no IPs are available in that ASN, the gateway either fails the request or falls back to a secondary ASN, depending on the configuration.
03The trust disparity
Not all IPs are treated equally. A request from an AWS datacenter IP (ASN 16509) starts with a massive trust deficit and will likely face a CAPTCHA immediately. A request from a Verizon mobile IP (ASN 22394) is assumed to be a human on a smartphone and is given significant leeway. ASN targeting exploits this disparity by ensuring your scraper always wears the "uniform" of a highly trusted network.
04How DataFlirt handles it
We don't blindly use premium ASNs for every request. Our routing engine profiles each target's WAF sensitivity and maps it to the lowest-cost ASN tier that guarantees success. If a target allows datacenter IPs, we use them. If they require residential, we target specific high-trust consumer ASNs. This dynamic routing ensures our pipelines are both resilient and cost-efficient.
05The "dirty" residential ASN problem
Just because an ASN is residential doesn't mean it's clean. Some smaller ISPs are heavily exploited by cheap proxy networks, causing their entire ASN to be flagged by major CDNs like Cloudflare. ASN targeting allows you to explicitly exclude these "dirty" ASNs and focus only on top-tier providers that WAFs cannot afford to block.
// 03 — the trust math

How classifiers
score an ASN.

Anti-bot vendors maintain dynamic trust scores for every ASN globally. DataFlirt models these scores to optimize our proxy routing and prevent subnet-level bans.

ASN Trust Score = T = 1 − (bot_traffic / total_traffic)
High T = residential/mobile. Low T = datacenter/VPN. Standard WAF heuristic
Block Probability = P(block) = f(TASN, req_rate, fingerprint)
A high-trust ASN allows higher request rates before triggering a CAPTCHA. Anti-bot classifier model
DataFlirt ASN Diversity = D = unique_ASNs / total_IPs_used
D > 0.4 prevents subnet-level bans during high-volume crawls. Internal SLO
// 04 — proxy gateway trace

Targeting Jio
in Mumbai.

A live trace of a scraper requesting a specific mobile ASN to bypass a strict geo-fenced and ISP-fenced API.

ASN 55836Mobile IPGeo-targeted
edge.dataflirt.io — live
CAPTURED
// outbound request
proxy_auth: "user-df_mobile-asn_55836-loc_in_bom"
target_url: "https://api.target.in/v1/inventory"

// gateway resolution
pool_lookup: ASN 55836 (Reliance Jio Infocomm)
available_ips: 14,208
selected_ip: "49.37.x.x"

// connection established
tls_fingerprint: matched_android_chrome

// target response
waf_check: passed // ASN trust score > 0.9
status: 200 OK
bytes_received: 42,108
// 05 — ASN blocking triggers

Why ASNs get
blacklisted.

Even residential ASNs can be flagged if traffic patterns deviate from human norms. These are the primary reasons an ASN loses its trust score.

SAMPLE SIZE ·  ·  ·  ·    12M requests
WINDOW ·  ·  ·  ·  ·  ·   7d trailing
UPDATED ·  ·  ·  ·  ·  ·  2026-05-19
01

High request velocity

rate limit · Too many requests from a single IP
02

Headless browser signatures

fingerprint · Mismatch between ASN and client
03

Proxy exit node concentration

network · Too many IPs from the same subnet
04

Lack of session persistence

behavior · Constant IP rotation on stateful targets
05

Geographic mismatch

geo · ASN location doesn't match target audience
// 06 — DataFlirt's routing engine

Dynamic ASN selection,

optimizing for cost and success rate.

Not every target requires a premium mobile ASN. DataFlirt's routing engine dynamically downgrades to cheaper datacenter or ISP proxies when the target's classifier allows it, and upgrades to high-trust residential ASNs only when necessary. This keeps pipeline costs predictable while maintaining a 99.9% success rate.

routing.policy.json

ASN targeting rules for a multi-tier scraping job.

target.domain strict-api.com
primary.asn ASN 7922 (Comcast)residential
fallback.asn ASN 7018 (AT&T)residential
datacenter.allow false
rotation.policy per_session
success.rate 99.94%
cost.tier premium

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// 07 — FAQ

Common
questions.

About ASN targeting, proxy routing, ISP trust scores, and how DataFlirt manages proxy pools at scale.

Ask us directly →
What is an ASN? +
An Autonomous System Number (ASN) is a unique identifier assigned to a network that controls a block of IP addresses. ISPs like Comcast, mobile carriers like Verizon, and cloud providers like AWS all have their own ASNs. Anti-bot systems use ASNs to determine the origin and trustworthiness of an IP address.
Why not just use any residential proxy? +
Not all residential proxies are equal. Some proxy providers use low-tier ISPs or "dirty" ASNs that have been burned by excessive bot traffic. By targeting specific, high-trust ASNs, you ensure your traffic blends in with legitimate, high-value users, drastically reducing block rates.
Can a target block an entire residential ASN? +
It's rare but possible. Blocking a major consumer ISP like Comcast (ASN 7922) would mean blocking millions of legitimate users, which most businesses won't do. However, they might rate-limit specific subnets within that ASN if they detect concentrated bot activity.
How does DataFlirt know which ASN to target? +
We maintain a dynamic mapping of target domains to ASN success rates. Our routing engine continuously tests different ASNs against a target's anti-bot classifier and automatically selects the most cost-effective ASN that maintains our 99.9% success rate SLO.
Is ASN targeting legal? +
Yes. ASN targeting is simply a method of routing your HTTP requests through specific networks. It does not alter the legality of the scraping activity itself, which depends on factors like data publicness, copyright, and adherence to terms of service.
How does ASN targeting affect scraping costs? +
Targeting specific ASNs, especially premium mobile carriers or top-tier residential ISPs, typically costs more than using a generic rotating proxy pool. DataFlirt mitigates this by using dynamic routing—only paying for premium ASNs when the target's security posture requires it.
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// 08 — keep reading

Related glossary terms

Anti-Bot Bypass

ASN Blocking

When a target blacklists an entire network, rendering all its IPs useless.

Read →
IP Proxies

ISP Proxy

Datacenter-hosted IPs registered under consumer ISPs for high trust and high speed.

Read →
Anti-Bot Bypass

Residential IP Detection

How WAFs determine if an IP actually belongs to a home user.

Read →
IP Proxies

Proxy Pool

The collection of IPs your scraper rotates through to distribute request volume.

Read →