Are you sure you mean switchport? IPs aren't assigned to a switchport. They can be assigned to switches. When an IP is assigned to a switch, it's permanent. They are also assigned to computers, usually by a DHCP server, which has a lease period, but that can be set to many different lengths.
IPv6 address
It is called subnetting. Subnetting is taking an address range (for example a class C address range) and assigning VLSM (variable length subnet masks) to break it up into smaller address ranges.
It is called as VLSM (Variable Length Subnet Mask) which is a type of Classless Inter-domain Routing(CIDR). Most commonly it's referred to as subnetting.
format prefix
It is called duration.
The length of a leaf is typically referred to as the leaf blade length.
The distance from a lens to the focal point is called the focal length.
circumrenceThe length around a circle is called the circumference
Yes, your credit line is based on your monthly income your current debt and length of residence at your current address.
A length of water over where the wind has blown is called a Fetch.
It is called the circumference.
It is called its circumference!