I am trying to access additional information about a failed batch job. 

I read the doc at https://developer.salesforce.com/docs/atlas.en-us.api_asynch.meta/api_asynch/asynch_api_batches_get_info_all.htm
The solution there is to build a URL to form a GET request to return information about a particular job.

Here is the general form of the URL:
https://instance_name—api.salesforce.com/services/async/APIversion/job/jobid/batch

So I then substituted the specifics of my org into this url, and the URL becomes 
https://NA##—api.salesforce.com/services/async/42/job/7071J00008J6XVu/batch (## is instance server)

This should take me to information about the batch. But it doesn't.
It redirects me to 
https://xn--na##api-516c.salesforce.com/services/async/42/job/7071J00008J6XVu/batch

And then I get the following error message in my web browser: 
"This site can’t be reached
xn--naXXapi-516c.salesforce.com’s server IP address could not be found.
Try running Network Diagnostics.
DNS_PROBE_FINISHED_NXDOMAIN"

No information about my batch job is provided.

What is this website?
I formed the URL correctly, so what is going wrong?

SF Support said I needed to access it via API, but the docs said a simple GET request shoudl return info...so what lightweight tool can i use to just get Apex batch info from a jobid?

 I am trying to access additional information about a failed batch job. 

I read the doc at https://developer.salesforce.com/docs/atlas.en-us.api_asynch.meta/api_asynch/asynch_api_batches_get_info_all.htm
The solution there is to build a URL to form a GET request to return information about a particular job.

Here is the general form of the URL:
https://instance_name—api.salesforce.com/services/async/APIversion/job/jobid/batch

So I then substituted the specifics of my org into this url, and the URL becomes 
https://NA##—api.salesforce.com/services/async/42/job/7071J00008J6XVu/batch (## is instance server)

This should take me to information about the batch. But it doesn't.
It redirects me to 
https://xn--na##api-516c.salesforce.com/services/async/42/job/7071J00008J6XVu/batch

And then I get the following error message in my web browser: 
"This site can’t be reached
xn--naXXapi-516c.salesforce.com’s server IP address could not be found.
Try running Network Diagnostics.
DNS_PROBE_FINISHED_NXDOMAIN"

No information about my batch job is provided.

What is this website?
I formed the URL correctly, so what is going wrong?

SF Support said I needed to access it via API, but the docs said a simple GET request shoudl return info...so what lightweight tool can i use to just get Apex batch info from a jobid?