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The manual method for determining the ASN of a network involves the following steps:

1. Identify the IP address of the network you want to look up.
2. Visit a public whois database, such as https://whois.arin.net/ or http://ipwhois.io/.
3. Enter the IP address in the search bar.
4. Look for the "AS" field in the results.
5. The number listed in the "AS" field is the ASN of the network.