Network Toolbox
The network engineer's pocket knife. Everything runs in your browser.
no cookies
no ads
no tracking
no nonsense
What's my IP?
as seen by this server
your address
looking…
reverse DNS
…
Subnet calculator
IPv4 CIDR
calculate
DNS lookup
DNS-over-HTTPS, straight from your browser
A
AAAA
MX
TXT
NS
CNAME
SOA
CAA
PTR
cloudflare
google
resolve
Whois
RDAP, the modern registry protocol
look up