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.
It is called the circumference.
It is called its circumference!
A length of water over where the wind has blown is called a Fetch.