Can't be done.  ISP provides packet transit, not just an IP address.  If they don't route your traffic, you're fucked. An ISP is much more than, "Here's your DHCP-assigned IP address/DNS server".  It is the provider which routes your traffic to and from your endpoint (computer) and the internet at large.  You are a part of their network.  If they decide you don't get packet transit, you don't get packet transit. Particularly with how most people get ISP service today:  via a cable modem or DSL modem.  Both of these must be provisioned by the ISP and listed as active on your account.  Changing the MAC does not magically get you someone else's provisioning, and thus turn your equipment back "on".  Your modem is delisted, you don't authenticate to the headend, and you don't get transit. Best bet:  Cellphone networks rely too heavily these days on packet-based networking from the tower upstream, so that can't really be disabled without effectively taking down the entire set of cellphone networks.  So if your ISP stops working, tether to your cellphone for data. There are ways to hijack satellite comms, but it requires a few hundred dollars in equipment at a minimum and much more knowledge than the average hacker has. Packet radio is just relaying to a computer connected to an ISP on the other end, so that won't work. All that being said, there are several less-than-nuclear options for "disabling" internet access, some of which have workarounds: 1) globally wipe BGP tables.  No more routing, no more internet.  The L0pht alluded to this in testimony to Congress in the 90s.  Not much of a way around it, because the internet relies on all the routers having correct routing tables (which is why it's such a serious point of failure) 2)  Disable DNS for a set of people.   There are other nameservers (and even other root nameservers), and the DNS protocol can be tunneled through SSL, HTTP, or any of a number of other means.  local hosts files also work (and was, in fact, how everything worked before Mockapetris invented DNS) 3) take away your DHCP lease.  Yes, this is where changing your MAC and/or IP will get you back online. I mean, internet without an ISP can be done:  Go get assigned an ASN, establish peering, and get people to advertise your routes.  But then, YOU have become an ISP.  And it ain't cheap.