How to Get Hostname from Ip (Linux)

How to get hostname from IP (Linux)?

In order to use nslookup, host or gethostbyname() then the target's name will need to be registered with DNS or statically defined in the hosts file on the machine running your program. Yes, you could connect to the target with SSH or some other application and query it directly, but for a generic solution you'll need some sort of DNS entry for it.

Linux C API for getting remote server's hostname?

Although you can query DNS for hostnames, there's no standard protocol to ask a machine (an interface, really) what it calls itself (if it does even have a name for itself - that's not mandatory).

You'd need to implement and deploy a simple server program onto all the hosts you're interested in (it could be something as simple as adding a line to /etc/inetd.conf to run /bin/hostname if it's a Unix-like system), and a client library to access it.

How to get hostname and IP address of an arbitrary jenkins node in a pipeline job

def find_ip(node_name){
    def node = Jenkins.instance.slaves.find{it.name.trim()==node_name.trim()}
    if(node) {
        def addr = InetAddress.getByName(node.computer.hostName)
        def ip = addr.getHostAddress()
        def host = addr.getHostName()
        println "host=${host} ip=${ip}"
        return host
    }
}

Linux command to translate domain name to IP

Use this

$ dig +short stackoverflow.com

69.59.196.211

or this

$ host stackoverflow.com

stackoverflow.com has address 69.59.196.211
stackoverflow.com mail is handled by 30 alt2.aspmx.l.google.com.
stackoverflow.com mail is handled by 40 aspmx2.googlemail.com.
stackoverflow.com mail is handled by 50 aspmx3.googlemail.com.
stackoverflow.com mail is handled by 10 aspmx.l.google.com.
stackoverflow.com mail is handled by 20 alt1.aspmx.l.google.com.

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