What IP address is my device using and who is the ISP?

Check IPv6 Compatibility
What's my DNS Server

Test Bandwidth (requires cookies)
IPv6 Address Types

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Test Bandwidth Command Line Bandwidth Test: wget --report-speed=bits -O /dev/null curl -o /dev/null Test SSL/TLS Capabilities of Your Browser Test Firewall Test VPN Service Test DNS Test cookies Peering Resources Pingable IPv4 Addresses Check Browser Check Email Address Validity Network Tools Online Tools Internet Health
IPv6 Address Types Pingable IPv4 Addresses
Command Line Tools dig fping host mtr (alternative to traceroute, ping) nmap ncat nping ping whois