What is ASN monitoring and why does it matter for affiliate campaigns?
Published 2026-05-16 · 7 min read
TL;DR
An ASN (Autonomous System Number) identifies a single provider's network — e.g. Vivo = AS26599, Claro Brasil = AS28573, Jio = AS55836. ASN monitoring checks your campaign URL from inside those specific networks, not just "from Brazil." It matters because you buy traffic per network: if the offer is blocked on Claro but works on Vivo, a country-level check looks green while a big slice of your paid clicks silently fail.
Key points
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Same GEO, different networks. Two users in São Paulo — one on Vivo (AS26599), one on Claro (AS28573) — can get completely different results for the same URL.
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You buy traffic per network. Push, pop, and mobile inventory is delivered through specific carriers. A carrier-level block hits exactly the source you're paying for.
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Country-level checks hide it. "Works in Brazil" can be true on average and still mean 40% of your real clicks land on a block page.
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Datacenter monitors can't see it. Pingdom, UptimeRobot, and StatusCake check from cloud IPs — they have no presence inside Jio (AS55836) or MTS (AS8359), so they never reproduce the block.
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It turns "bad traffic" into a fixable problem. An ASN-level diagnosis tells you whether to blame the source, the creative, or a network block — with screenshot proof.
Same GEO, different networks
One offer page, one country (Brazil), one moment in time — checked from four provider networks. This is the core reason ASN matters. Illustrative example:
Vivo / Telefônica — AS26599
200 · loads normally
User reaches the offer page.
Claro Brasil — AS28573
403 · block page
Paid click wasted, conversion lost.
TIM — AS26615
200 · slow / partial
Loads, but render is degraded.
Oi — AS7738
302 · wrong page
Redirect lands on the wrong destination.
Example data for illustration. ASNs shown are real Brazilian provider networks; the statuses are a sample scenario, not a measurement of any specific site.
How to set up ASN monitoring for a campaign
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1
List the networks you actually buy from. Per GEO, name the top ISPs and mobile carriers — Brazil: Vivo, Claro, TIM, Oi; India: Jio, Airtel, Vi, BSNL; Russia: MTS, Rostelecom, Beeline.
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2
Add the campaign URL as a host and select those countries plus the specific ASNs per country. One URL = one host keeps results clean.
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3
Run checks from inside each ASN — real residential/mobile networks — following the full redirect chain (tracking link → prelander → offer).
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4
Capture a screenshot per ASN so you can see whether the user got the offer, a block page, or a Cloudflare challenge.
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5
Compare ASNs side by side over time. A single-ASN failure points to ISP/carrier filtering; a country-wide failure points to a GEO block or outage.
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6
Alert per network and keep the evidence to share with the affiliate or traffic source when one carrier goes dark.
Common ASNs by market (reference)
| Country | Provider | Type | ASN |
|---|---|---|---|
| Brazil | Vivo / Telefônica | Fixed + mobile | AS26599 |
| Brazil | Claro Brasil | Fixed + mobile | AS28573 |
| Brazil | TIM | Mobile | AS26615 |
| India | Reliance Jio | Mobile | AS55836 |
| India | Bharti Airtel | Fixed + mobile | AS24560 |
| Russia | MTS | Fixed + mobile | AS8359 |
| Russia | Rostelecom | Fixed | AS12389 |
Large providers operate multiple ASNs; the numbers above are common primary ASNs for orientation.
Why this is a revenue problem, not just a technical one
When one network is blocked, the symptoms look exactly like bad traffic: clicks arrive, conversions don't, EPC drops, and the affiliate gets blamed. Without per-ASN visibility you can't tell the difference between a low-quality source and a network that's silently serving a block page. ASN monitoring gives you that answer — and the screenshot to prove it. It's the network-level half of the broader idea of access monitoring vs uptime monitoring.
FAQ
What is an ASN?
An ASN (Autonomous System Number) is a unique identifier for a provider's network on the internet — for example Vivo in Brazil is AS26599 and Jio in India is AS55836. Every ISP and mobile carrier operates one or more ASNs. When you monitor by ASN, your checks run from inside that specific provider's network instead of from a generic datacenter IP.
What is ASN monitoring?
ASN monitoring is checking whether your campaign URL, mirror, or landing page is reachable from a specific provider network (ISP or mobile carrier), not just from a country in general. It catches ISP-level blocks where users on one ASN can load the page while users on another ASN in the same country cannot.
Why does ASN matter for affiliate campaigns?
Because you buy traffic from specific networks. If your offer is blocked on Claro Brasil (AS28573) but works on Vivo (AS26599), a country-level check shows everything is fine while a large share of your paid clicks silently fail. ASN monitoring tells you exactly which network is losing you money.
Why can't regular uptime monitors check by ASN?
Tools like Pingdom, UptimeRobot, and StatusCake run checks from a handful of cloud datacenter regions. They have no presence inside consumer ISP or mobile carrier networks, so they cannot reproduce an ISP-level or carrier-level block. ASN monitoring requires checking from real residential and mobile networks.
How many ASNs should I monitor?
Start with the networks that send you the most traffic in each target GEO — usually the top 2–4 ISPs and mobile carriers per country. For Brazil that's typically Vivo, Claro, TIM, and Oi; for India, Jio, Airtel, Vi, and BSNL. Expand coverage as you scale into more markets.
What is the difference between ASN monitoring and GEO monitoring?
GEO monitoring checks access from a country as a whole; ASN monitoring checks access from individual provider networks inside that country. Two ASNs in the same GEO can behave completely differently, so ASN monitoring is more precise and catches blocks that GEO-only checks miss.
Edits
- 2026-05-16: First published.
Monitor your campaign URL per ASN
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