[PLUG] question on how to fix a mysterious DNS address problem

[American Citizen]

Some more information here about DNS 10.0.18.1

from URL https://www.lookip.net/ip/10.0.18.1

10.0.18.1

Here you can find all lookup results for private IP address 10.0.18.1. 
If you are trying to find how to login to your internet router, modem, 
extender or wireless access point, you can access the built-in HTML 
webpage by clicking the following link for http or https.

The most used default username and password to gain access to the 
administrative interface is 'admin' or 'setup' and in case of a TP Link, 
Netgear or D-Link wireless (or Wi-Fi) router you can also find the 
default settings on the back of the device. If this doesn't work or you, 
then you could choose to reset the router. To do this, you need to press 
and hold it's reset button for approximately 10 seconds. This will 
restore the factory settings and enables you to log in with the details 
specified on the sticker.

IP address 10.0.18.1 is registered by the Internet Assigned Numbers 
Authority (IANA) as a part of private network 10.0.18.0/24.
IP addresses in the private space are not assigned to any specific 
organization, including your ISP (Internet Service Provider), and 
everyone is allowed to use these IP addresses without the consent of a 
regional Internet registry as described in RFC 1918, unlike public IP 
addresses.

However, IP packets addressed from a private range cannot be sent 
through the public Internet, and so if such a private network needs to 
connect to the Internet, it has to be done through a network address 
translator (also called NAT) gateway, or a proxy server (usually 
reachable on port 8080 or 8081 if it doesn't work directly).

An example of a NAT gateway would be a wired or wireless router you 
receive from a broadband provider. A gateway web interface should be 
available through the HTTP (Hypertext Transfer Protocol) and/or HTTPS 
(Hypertext Transfer Protocol Secure) protocols. To try this, you should 
enter 'http://ip address' or 'https://ip address' in the address bar of 
your favorite web browser like Google Chrome or Mozilla Firefox and log 
in with the username and password provided by your provider.

You can use these types of (private network) IP addresses in your local 
network and assign it to your devices such as a personal computer, 
laptop, tablet and/or smartphone. It is also possible to configure a 
range within a DHCP (Dynamic Host Configuration Protocol) server to do 
the IP assigning automatically.

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does this mean my internet provider is sneaking in this DNS covertly?