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Can annoying ip address (fax) be blocked?

New Poster

Can annoying ip address (fax) be blocked?

I am receiving calls at all hours from four sequential what appears to be ip addresses. Based on beeping sounds when answered, must be fax machine. Tried to enter numbers to block, but Comcast advises "invalid" number. Remedy thus far is to silence ringer. Searched ip address and it is listed as "private."
Contributor

Re: Can annoying ip address (fax) be blocked?

You may be able to get more info using this tool: http://centralops.net/co/