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Documentation Index

Fetch the complete documentation index at: https://docs.roundproxies.com/llms.txt

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ASN-targeting routes requests through residential IPs that belong to a specific Autonomous System — typically a single ISP or carrier. This is useful when a target site treats traffic differently based on the network operator (for example, mobile carriers vs. consumer broadband ISPs).
ASNs are 32-bit identifiers assigned by IANA/RIRs to networks that announce routes on the public internet. Each major ISP, mobile carrier, and hosting provider has one or more ASNs.

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Targeting Format

Add the asn parameter to your proxy username: 
client-{CLIENT_ID}-asn-{ASN_NUMBER}-session-{SESSION_ID}
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asn
string
required
Numeric ASN of the network you want to route through. Use the number only — do not include the AS prefix.
ParameterDescriptionExample
asnNumeric ASN identifier (no AS prefix)asn-3320

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Combining With Geo-Targeting

ASN-targeting can be combined with country to narrow the pool to IPs from a specific ISP within a single country: 
client-{CLIENT_ID}-country-Germany-asn-3320-session-{SESSION_ID}
State and city can be added on top, but the available IP pool shrinks quickly — start broad and refine only if needed.

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Example Request

import requests

proxies = {
    'http': 'http://client-{CLIENT_ID}-country-Germany-asn-3320-session-fnzwtath:{PASSWORD}@residential.roundproxies.com:5000',
    'https': 'http://client-{CLIENT_ID}-country-Germany-asn-3320-session-fnzwtath:{PASSWORD}@residential.roundproxies.com:5000'
}

response = requests.get('https://api.ipify.org?format=json', proxies=proxies)
print(response.json())

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Finding an ASN

You can look up the ASN of any IP or ISP using public tools:
  • bgp.he.net — search by ISP name or IP
  • ipinfo.io — returns ASN alongside IP metadata
  • whois <ip> from the command line
Common examples:
ISPASN
Deutsche Telekom (Germany)3320
Comcast (US)7922
Vodafone (UK)5378
Bezeq International (Israel)8551

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Troubleshooting

  • No Available IPs for Targeting — the requested ASN has no live IPs at the moment, or it doesn’t intersect with your country/state constraints. Drop the geo refinements or try a related ASN from the same carrier.
  • Invalid Targeting Parameter — ensure the ASN is numeric only (e.g. asn-3320, not asn-AS3320).
  • See Error Handling for the full list of proxy errors.