You can use this BASH Script to generate Domain Backlinks
domains.txt is the list of you domains. one line per line.
The following script visits a few websites with your domain name as a url parameter. After the curl command those websites crawl your website and you have a backlink of those sites. You can even extend that list.
#!/bin/bash
while IFS='' read -r line || [[ -n "$line" ]]; do
echo "$line"
curl --head http://tools.tracemyip.org/lookup/$line
curl --head https://www.abuseipdb.com/whois/$line
curl --head https://www.bombstat.com/domain/$line
done < domains.txt