Network Tools
Need to figure out your IPv4 when you're dual-stacked with IPv6? Curious which one your stack prefers?
Want to see how your client handles weird TLS? Or HTTP/3?
IP
Find your public IPv4, IPv6 or check what your network stack prefers.
- ip.søb.org - IPv4 and IPv6
- ipv4.søb.org - only IPv4
- ipv6.søb.org - only IPv6
HTTP
Test which HTTP versions your client supports. http.søb.org negotiates the best available version, while the versioned subdomains let you force a specific protocol - useful when debugging proxies, load balancers, or client behaviour.
- http.søb.org - HTTP/1.1, HTTP/2, HTTP/3
- http11.søb.org - only HTTP/1.1
- http2.søb.org - only HTTP/2
- http3.søb.org - only HTTP/3
TLS
Check which TLS versions your client supports. tls.søb.org accepts both TLS 1.2 and 1.3, while the versioned endpoints are strict. Also available: a short-lived certificate issued via the ACME shortlived-profile, and an endpoint serving a valid certificate without a hostname.
- tls.søb.org - TLS 1.2 and TLS 1.3
- tls12.søb.org - only TLS 1.2
- tls13.søb.org - only TLS 1.3
- tls-short.søb.org - cert from the shortlived ACME profile (new!)
- https://135.181.87.135/ - IP certificate (new!)
Misc
- info.søb.org - A collection of everything (IP, HTTP and TLS)
- slow.søb.org - loads forever; handy for testing timeout behaviour (new!)
- $ dig +short dns-info-experimential.xn--sb-lka.org TXT (new!) - find your (upstream) DNS resolvers IP and ASN