I'm trying to figure out how to find the hostnames of computers on the LAN network. I put in the known address of a computer, but I'm getting an error I don't understand.

```
michaelsavich@noranetserver:~$ host 10.1.10.10
10.10.1.10.in-addr.arpa has no PTR record

```

Both computers are on the same LAN, so the issue isn't with port forwarding or anything. For the record, the computer I ran host on was running Ubuntu Server 14.04 LTS, and 10.1.10.10 should belong to a MacBook.