Why is the wrong hostname displayed?

Question

Domain Name System

Hello.
I recently noticed that the wrong hostname is displayed in the MacBook Air terminal on my home network.

# Dimko @ 10 in ~ [20:59:50]
$ hostname
10.kuzbassfond.ru

Connected via AP of my Xiaomi

# Dimko @ Kenglab in ~ [20:58:59]
$ hostname
Kenglab

The router is mikrotik 2011 with the current firmware (Stable).
Console using iTerm with zsh.
10 before kuzbassfond.ru is the internal ip of the laptop (192.168.88.10).
DNS

# Dimko @ Kenglab in ~ [21:06:50]
$ cat /etc/resolv.conf
#
# Mac OS X Notice
#
# This file is not used by the host name and address resolution
# or the DNS query routing mechanisms used by most processes on
# this Mac OS X system.
#
# This file is automatically generated.
#
nameserver 192.168.88.1
nameserver 212.75.210.62
nameserver 212.75.211.2

The question is, where did this kuzbassfond.ru come from? His IP is not associated with my external IP at all.

Answer 1

The host name / domain is not determined by the IP address, but returned by the DHCP server, to answer your question, you need to look at the router configuration.