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PDP-10.its/doc/wiki/its_hosts

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<h4 id="updating_its_host_table">Updating ITS&#039; host table</h4>
<div class="level4">
<p>
ITS was used mostly in the era before <abbr title="Domain Name System">DNS</abbr>, when a hosts.txt file was regularly distributed to all Arpanet hosts. If you want to add a new host and its IP number, you have to update ITS&#039; host table.
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<p>
ITS&#039; human readable host table is in the file <code>SYSHST; H3TEXT &gt;</code>. You update it with a regular text editor. To add a new host, enter a line like <code>HOST : A.B.C.D : NAME : MACHINE : <abbr title="Operating System">OS</abbr> : :</code>. A.B.C.D is the IP number, and NAME is the hostname. MACHINE and <abbr title="Operating System">OS</abbr> are free text descriptions.
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<p>
Having done this, you have to update the binary host table <code>SYSBIN; HOSTS3 &gt;</code> which is what programs actually use to look up host names. To update this from the text file, just run <code>:SYSHST;H3MAKE</code>.
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