Ports listening on G3100 router?

[#1]

I ran an nmap scan against my G3100 router and came across the following results.  Anyone know what the services are that are running?

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Nmap scan report for G3100.myfiosgateway.com (192.168.1.1)

Host is up (0.0018s latency).

Not shown: 65528 closed ports

PORT      STATE    SERVICE

53/tcp    open     domain

80/tcp    open     http

443/tcp   open     https

1990/tcp  open     stun-p1

4577/tcp  filtered unknown

39543/tcp open     unknown

46413/tcp open     unknown

MAC Address: B8:F8:53:56:70:AA (Unknown)

Nmap done: 1 IP address (1 host up) scanned in 7.30 seconds

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tcp/53 is likely related to DNS and both tcp/80 and tcp/443 are likely the management interface.  Any thoughts on the other listening ports?

[#2]

Not sure why you are interested at the ports. If you are very conscious of the security, I suggest you to buy a security gateway.

Some ports are Verizon diagnostics for STBs, MoCA devices and extender.

Some ports can be triggered to open by the request of an internal device.

[#3]

Confirming what the other user said - not sure about the 1990 but the other higher ports are for STB/DVR etc.. here's some info on that - https://www.dslreports.com/faq/16710