ZyXEL NBG-419N Podręcznik Użytkownika Pobierz pdf (Strona 244)

Appendix B IP Addresses and Subnetting

NBG-419N User’s Guide

244

As these two IP addresses cannot be used for individual hosts, calculate the

maximum number of possible hosts in a network as follows:

Notation

Since the mask is always a continuous number of ones beginning from the left,

followed by a continuous number of zeros for the remainder of the 32 bit mask,

you can simply specify the number of ones instead of writing the value of each

octet. This is usually specified by writing a “/” followed by the number of bits in

the mask after the address.

For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with subnet mask

255.255.255.128.

The following table shows some possible subnet masks using both notations.

Table 83 Maximum Host Numbers

SUBNET MASK HOST ID SIZE

MAXIMUM NUMBER OF

HOSTS

8 bits 255.0.0.0 24 bits 2

– 2 16777214

16 bits 255.255.0.0 16 bits 2

– 2 65534

24 bits 255.255.255.0 8 bits 2

– 2 254

29 bits 255.255.255.2

3 bits 2

– 2 6

Table 84 Alternative Subnet Mask Notation

SUBNET

MASK

ALTERNATIVE

NOTATION

LAST OCTET

(BINARY)

LAST OCTET

(DECIMAL)

255.255.255.0 /24 0000 0000 0

255.255.255.12

/25 1000 0000 128

255.255.255.19

/26 1100 0000 192

255.255.255.22

/27 1110 0000 224

255.255.255.24

/28 1111 0000 240

255.255.255.24

/29 1111 1000 248

255.255.255.25

/30 1111 1100 252

1 2 ... 239 240 241 242 243 244 245 246 247 248 249 ... 297 298

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ZyXEL NBG-419N Podręcznik Użytkownika Strona 244

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