Dnscan Alternatives
Dnscan is described as 'python wordlist-based DNS subdomain scanner. The script will first try to perform a zone transfer using each of the target domain's nameservers. If this fails, it will lookup TXT and MX records for the domain' and is an app. There are three alternatives to Dnscan for Linux, Online / Web-based and Self-Hosted solutions. The best alternative is OWASP Amass, which is both free and Open Source. Other great apps like Dnscan are Sublist3r and Lepus Subdomain finder.
The OWASP Amass Project has developed a tool to help information security professionals perform network mapping of attack surfaces and perform external asset discovery using open source information gathering and active reconnaissance techniques.
Sublist3r is a python tool designed to enumerate subdomains of websites using OSINT. It helps penetration testers and bug hunters collect and gather subdomains for the domain they are targeting.
Online Subdomain finder and subdomain Enumerating tools using Sublist3r, DNscan, Nmap, Anubis and Amass. Discover subdomains of target domain. 8 subdomain tools hosted online.