FREE NETWORK & FILE TRANSFER TOOLS

Free FTP, SFTP, DNS and TLS Testing Tools

Diagnose FTP, FTPS and SFTP connectivity issues directly from your browser using our collection of free online network and file transfer tools. Verify DNS records, open ports, SSH fingerprints, TLS certificates, authentication settings and server configuration without installing any software.

Whether you are deploying a new server, troubleshooting connection problems or validating security settings, these tools provide fast diagnostics for system administrators, developers, DevOps engineers and IT teams.

Quick Access

FTP Connection SFTP Connection FTP Features Port Checker SSH Fingerprint TLS Certificate DNS Checker

Tools description

FTP Connection Test Tool

Test FTP and FTPS servers online. Verify DNS resolution, connectivity, authentication, passive mode support, TLS configuration, certificates and supported FTP features.

  • ✓ FTP Connectivity
  • ✓ FTPS / TLS Support
  • ✓ Certificate Validation
  • ✓ FTP Features & Diagnostics
Open FTP Test →

SFTP Connection Test Tool

Verify SSH and SFTP server configuration. Test connectivity, authentication, host keys, fingerprints and SFTP subsystem availability.

  • ✓ SSH Connectivity
  • ✓ Host Key Verification
  • ✓ Fingerprint Validation
  • ✓ SFTP Authentication
Open SFTP Test →

FTP Feature Decoder

Decode FTP FEAT responses and understand what FTP server capabilities are supported, including TLS, UTF-8, MLST, MDTM and file transfer extensions.

  • ✓ Decode FTP FEAT Output
  • ✓ Explain FTP Capabilities
  • ✓ Identify FTPS Support
  • ✓ Understand Server Extensions
Open FTP Feature Decoder →

FTP Port Checker

Verify FTP, FTPS, SFTP, HTTP and HTTPS ports. Detect service banners and validate that the expected protocol is running on each port.

  • ✓ FTP Port 21 Check
  • ✓ SFTP Port 22 Check
  • ✓ HTTPS Port 443 Check
  • ✓ Protocol Banner Detection
Open FTP Port Checker →

SSH Fingerprint Lookup

Retrieve SSH host fingerprints, host keys and encryption algorithms. Useful for validating SSH server identity and security configuration.

  • ✓ SSH Host Key Lookup
  • ✓ SHA256 Fingerprint Check
  • ✓ Algorithm Detection
  • ✓ Server Identity Verification
Open SSH Fingerprint Lookup →

TLS Certificate Checker

Inspect SSL and TLS certificates, expiration dates, issuers, SAN entries and supported TLS versions for any public hostname.

  • ✓ TLS Version Detection
  • ✓ Certificate Expiry Check
  • ✓ Issuer and Common Name Lookup
  • ✓ Subject Alternative Name Inspection
Open TLS Certificate Checker →

DNS Checker

Lookup A, AAAA, MX, TXT, NS and reverse DNS records. Verify DNS configuration and troubleshoot domain resolution issues.

  • ✓ A and AAAA Records
  • ✓ MX and TXT Records
  • ✓ Nameserver Lookup
  • ✓ Reverse DNS Check
Open DNS Checker →

Why use these tools?

Network and file transfer problems are often caused by DNS issues, firewall restrictions, incorrect credentials, expired certificates or server configuration mistakes. These free diagnostic tools help you quickly identify the source of the problem and verify that your FTP, FTPS, SFTP, SSH and TLS services are configured correctly.

Tools built for FTP, SFTP and infrastructure teams

Most online diagnostic tools focus on websites and HTTP services. This toolkit is designed specifically for file transfer and infrastructure workloads including FTP, FTPS, SFTP, SSH and TLS-enabled services. The tools help identify network, authentication and encryption problems commonly encountered when deploying or operating secure file transfer systems.