IP Addressing Presentation  

Subnet Masks
bits	mask	inverse	step	# of hosts
16 bit	255.255.0.0	0.0.255.255	Even Break	65,534
17 bit	255.255.128.0	0.0.127.255	by 128's	32,766
18 bit	255.255.192.0	0.0.63.255	by 64's	16,382
19 bit	255.255.224.0	0.0.31.255	by 32's	8,190
20 bit	255.255.240.0	0.0.15.255	by 16's	4.094
21 bit	255.255.248.0	0.0.7.255	by 8's	2,046
22 bit	255.255.252.0	0.0.3.255	by 4's	1,022
23 bit	255.255.254.0	0.0.1.255	by 2's	510
24 bit	255.255.255.0	0.0.0.255	Even Break	253
25 bit	255.255.255.128	0.0.0.127	by 128's	126
26 bit	255.255.255.192	0.0.0.63	by 64's	62
27 bit	255.255.255.224	0.0.0.31	by 32's	30
28 bit	255.255.255.240	0.0.0.15	by 16's	14
29 bit	255.255.255.248	0.0.0.7	by 8's	6
30 bit	255.255.255.252	0.0.0.3	by 4's	2

Private Network Addresses
10.x.x.x	1 Class A
172.16.x.x through 172.31.x.x	32 Class B's
192.168.x.x	255 Class C's

Common Multicast Addresses
all hosts on this subnet	224.0.0.1
all routers on this subnet	224.0.0.2
DVMRP routers	224.0.0.4
all OSPF routers	224.0.0.5
all OSPF DRs	224.0.0.6
ST routers	224.0.0.7
ST hosts	224.0.0.8
RIPv2	224.0.0.9
EIGRP	224.0.0.10
VTMP managers group	224.0.1.0
Network Time Protocol	224.0.1.1
SGI Dogfight	224.0.1.2
rwhod	224.0.1.3
VNP	224.0.1.4
Artificial Horizons Aviator (game)	224.0.1.5
Name Service Server	224.0.1.6
Audio News Multicast	224.0.1.7
SUN NIS/Information Service	224.0.1.8
Multicast Transport Protocol	224.0.1.9
rwho group	224.0.2.1
SUN RPC PMAPPROC_CALLIT	224.0.2.2
DLSW Groups	224.0.10.x
NCC Net Audio	224.0.11.x
Microsoft & MSNBC	224.0.12.x
SDR	224.2.127.253
SDR	224.2.127.254
SDR	224.2.127.255