D-Link DES-3250TG User Manual page 49

The dots are included to make the numbers easier to read.
Eight binary bits are called a 'byte' or an 'octet'. An octet can
represent any decimal value between '0' (00000000) and '255'
(11111111). IP addresses, represented in decimal form, are
four numbers whose value is between '0' to '255'. The total
range of IP addresses are then:
Lowest possible IP address -
Highest possible IP address -
To convert decimal numbers to 8-bit binary numbers (and vice-
versa), you can use the following chart:
Binary Octet Digit
Decimal Equivalent
Binary Number
128+64+32+16+8+4+2+1=
255
Table 5- 2. Binary to Decimal Conversion
Each digit in an 8-bit binary number (an octet) represents a
power of two. The left-most digit represents 2 raised to the 7
power (2x2x2x2x2x2x2=128)
represents 2 raised to the 0
0 power is equal to one, by definition).
th
IP addresses actually consist of two parts, one identifying the
network and one identifying the destination (node) within the
network.
The IP address discussed above is one part and a second
number called the Subnet mask is the other part. To make this
a bit more confusing, the subnet mask has the same numerical
form as an IP address.
DES-3250TG Layer 2 Fast Ethernet Switch User's Guide
0.0.0.0
255.255.255.255
7 6 5
2 2 2
128 64 32
1 1 1
while the
power (any number raised to the
th
41
4 3 2 1
2 2 2 2 2
0
16 8 4 2 1
1 1 1 1 1
th
right-most digit