For frequently changing IPs there are also services like
which provide you with a third-level domain like xyz.duckdns.org
For frequently changing IPs there are also services like
which provide you with a third-level domain like xyz.duckdns.org
For anything with even the smallest bit of value, a cheap tld like .party can be had for a decade for around $20.
E-mail is one example. Technically domain names are not necessary to successfully send own mail with own server, i.e., without using a 3rd party email provider. E-mail predates DNS; mail software has always supported IP addresses. However, today, the dominant 3rd party e-mail providers will reject mail coming from an IP address not associated with a domain name.
It offers a lot for free; I started using it when I moved off cloudflare and have quite liked it.
The free .tk domains are only free for 1 year. And even if you are only going to use it for a year, some people would rather not give out their credit card number for a free trial.
Now I’m wondering, how does Freenom make money?