I changed my no-ip account, because of known problems (THX Microsoft!!!).
Now I have 3 hosts in domain:
may_domain-1.ddns.net
may_domain-2.ddns.net
may_domain-3.ddns.net

I want to change ip addres for particular host to for example to 1.2.3.4.
How can I do it from Linux command line? I can do it for host on which I am run command like this:

noip -u user -p 'pass' -i 1.2.3.4

But it change IP for the host I am running "noip" command from. Lets say -> may_domain-1.ddns.net

How to change IP from the same host for: may_domain-2.ddns.net and may_domain-3.ddns.net ?

There is no such option in noip command:

[root@mackowiak ~]# noip -h

USAGE: noip [ -C [ -F][ -Y][ -U #min]
[ -u username][ -p password][ -x progname]]
[ -c file][ -d][ -D pid][ -i addr][ -S][ -M][ -h]

Version Linux-2.1.9
Options: -C create configuration data
-F force NAT off
-Y select all hosts/groups
-U minutes set update interval
-u username use supplied username
-p password use supplied password
-x executable use supplied executable
-c config_file use alternate data path
-d increase debug verbosity
-D processID toggle debug flag for PID
-i IPaddress use supplied address
-I interface use supplied interface
-S show configuration data
-M permit multiple instances
-K processID terminate instance PID
-z activate shm dump code
-h help (this text)

Any idea what to do?

As far as I know the client will only apply updates for that particular computer. You will still need to update the client configuration on each computer etc to reflect the new name anyway.

Can you update the IP address for your hosts on no-ip's website?

The problem is that I have several customers with dynamic IP and several with constant. I dont want to pay for NOIP so I created small for that users equipped in own servers and 2 times per week I change (during night) IP to any random and then revert to original. So such IP addresses were "touched" and are not removed from NOIP system.
But most of such my customers does not have routers with NOIP support or any unit inside home network available for me, I can install no-ip client on it. Basically it is for surveillance cameras.
So I want to change IP address of distant location no my one (it is possible with my script) but it is not possible to revert it to original IP.
BUT !

Linux ManPage stands that there is "-L" option which allow to change IP for particular host defined in my NO-IP account.
I am looking for such implementation of noip client for Linux but I did not found one.

Look at the page:
http://www.linuxcertif.com/man/8/noip2/

And look at the -L option. Do You know about such implementation of noip client?
My and all other implementations I know does not has such option.

However, the posted website shows Version: October 2007 but no number. 2.1.9 is the latest version but does not have that option according to your original post (nor do I remember). Its possible that the option was removed. Have you tried using it? Have you asked no-ip?

The other option is to modify or write your own client per the instructions on no-ip's website.

1 members found this post helpful.

I will ask NO-IP but they have a lot of problems right now so probably time of response will be long.
But I have to ask...

OK. CURL + NO-IP WebAPI resolve problem. THX