Article 52RR2 Worried about open ports

Worried about open ports

by
hifi100
from LinuxQuestions.org on (#52RR2)
Code:$ nmap 192.168.225.1
Starting Nmap 7.70 ( https://nmap.org ) at 2020-04-28 14:59 IST
Nmap scan report for embms.jio.local (192.168.225.1)
Host is up (0.013s latency).
Not shown: 995 closed ports
PORT STATE SERVICE
53/tcp filtered domain
80/tcp open http
5555/tcp filtered freeciv
6666/tcp open irc
7777/tcp open cbt

Nmap done: 1 IP address (1 host up) scanned in 1.39 seconds192.168.225.1 is the IP of my router (Default Gateway).
I did a scan on grc.com & it passed the test.
But why are these ports open ? Is this a security threat ?latest?d=yIl2AUoC8zA latest?i=rrYdYT4BDRE:DxA_kPcyKt4:F7zBnMy latest?i=rrYdYT4BDRE:DxA_kPcyKt4:V_sGLiP latest?d=qj6IDK7rITs latest?i=rrYdYT4BDRE:DxA_kPcyKt4:gIN9vFwrrYdYT4BDRE
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