Looking for 240/4 Addresses

If you look through the IANA’s IPv4 address registry you will find a set of reservations which collectively are encompasses by the address prefix 240/4, and are annotated in the registry for “Future Use.” These entries reference RFC 1112 section 4, which states: “Class E IP addresses, i.e., those with…


IP Addresses through 2023

Time for another annual roundup from the world of IP addresses. Let’s see what has changed in the past 12 months in addressing the Internet and look at how IP address allocation information can inform us of the changing nature of the network itself. Back around 1992 the IETF gazed…


IP Addresses through 2022

Time for another annual roundup from the world of IP addresses. Let’s see what has changed in the past 12 months in addressing the Internet and look at how IP address allocation information can inform us of the changing nature of the network itself. Back around 1992 the IETF gazed…


What’s an “Address”?

I work at APNIC, the Regional Internet Registry that serves the Asia Pacific Region. APNIC provides common infrastructure services for the region that support the unique assignment of IP address blocks to Internet network operators within our region through the operation of an address registry. In short, IP addresses are…


IP Addressing through 2021

Time for another annual roundup from the world of IP addresses. Let’s see what has changed in the past 12 months in addressing the Internet and look at how IP address allocation information can inform us of the changing nature of the network itself. Back around 1992 the IETF gazed…


Some Notes from RIPE 83

The RIPE community held a meeting in November. Like most community meetings in these Covid-blighted times it was a virtual meeting. Here’s my notes from a few presentations that piqued my interest. All the material presented at the meeting can be found at https://ripe83.ripe.net/. Vulnerability Disclosure Responsible Disclosure is a…


IPv4 in the Headlines

The world of IPv4 addresses is a relatively obscure backwater of the Internet. All that drama of IPv4 address exhaustion happened with little in the way of mainstream media attention. So it came as a bit of a surprise to see a headline in the Washington Post about IPv4 addresses.…


Addressing 2020

Time for another annual roundup from the world of IP addresses. Let’s see what has changed in the past 12 months in addressing the Internet and look at how IP address allocation information can inform us of the changing nature of the network itself. Back around 1992 the IETF gazed…


Addressing 2019

Time for another annual roundup from the world of IP addresses. Let’s see what has changed in the past 12 months in addressing the Internet and look at how IP address allocation information can inform us of the changing nature of the network itself. Back around 1992 the IETF gazed…


Addressing 2018

Time for another annual roundup from the world of IP addresses. Let’s see what has changed in the past 12 months in addressing the Internet and look at how IP address allocation information can inform us of the changing nature of the network itself. Back in around 1992 the IETF…