curl --silent https://myipv4.p1.opendns.com/get_my_ip | jq --raw-output '.ip'
curl --silent https://eth0.me
curl --silent https://ifconfig.me/ip
curl --silent https://ipecho.net/plain
curl --silent https://ipinfo.io/ip
dig @resolver4.opendns.com myip.opendns.com +short

That last one is generally much faster than the rest.

Also, you can add -w '\n' to curl commands to make it add a newline.

ip -6 addr

I like to be sworn at in json:

curl myip.wtf/json

curl ifconfig.io works too

ipify.org is yet another.

curl https://api.ipify.org

You can also use curl "https://eth0.me"

% curl ipinfo.io/ip
curl: (7) Failed to connect to ipinfo.io port 80 after 25 ms: Connection refused
% curl https://ipinfo.io/ip
curl: (7) Failed to connect to ipinfo.io port 443 after 29 ms: Connection refused

They suck and apparently block curl (and lynx and elinks) from dynamic IP, it works in Firefox or on a server with static IP.

Another one is ifconfig.me/ip so

curl https://ifconfig.me/ip

that works.

Another one: curlmyip.net

Is 'ifconfig -all' no longer a thing?

ip -c -br a master race