Use the port scanner module in UDP mode to check if DNS (port 53) or SNMP (161) is truly open. The GUI differentiates between "open|filtered" and "closed" via response heuristics.
For raw power, Nmap’s Ncat is unbeatable on the CLI. But for rapid, interactive debugging and teaching, holds a unique niche. netcat gui v13exe upd
Do not trust a file just because it says "v13exe upd." Run a checksum (SHA-256) and compare it to the developer’s original release notes. If you found this on a forum, search for the hash on VirusTotal. Use the port scanner module in UDP mode