Gmail tells me that it was recently accessed by IP address
242.162.62.141, and that it blocked the suspicious access, and I should change my password immediately. But
242.162.62.141 is a reserved IP address according to IANA. It's not registered with RIPE, ARIN, AfriNIC, LACNIC or APNIC. So... How can this be? How could someone even use such an IP address in the first place, and try to access my Gmail account of all things?
All registries report the IP address as "reserved", and ARIN shows it as being owned by IANA. This is the description I found about the
240.0.0.0 - 255.255.255.255 range:
This block, formerly known as the Class E address space, is reserved for future use. The one exception to this is the "limited broadcast" destination address
255.255.255.255. As documented in the Standards RFC 919 and RFC 922, packets with this destination address are not forwarded at the IP layer. This block was reserved by the IETF in the Standard document, RFC 1112 and is further documented in the Best Current Practice document RFC 5735.