IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)172.16.5.4/20

network172.16.0.0/20

broadcast172.16.15.255

first host172.16.0.1

last host172.16.15.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classB

ipcalc 172.16.5.4/20

address10101100.00010000.00000101.00000100

subnet mask11111111.11111111.11110000.00000000

network10101100.00010000.00000000.00000000

broadcast10101100.00010000.00001111.11111111

green = network part, grey = host part

hex0xac100504

decimal2886731012

reverse dns4.5.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:504

/20 split into /31 · 2,048 subnets

close ×

#	network	host range	broadcast
1	172.16.0.0/31	172.16.0.0 – 172.16.0.1	172.16.0.1
2	172.16.0.2/31	172.16.0.2 – 172.16.0.3	172.16.0.3
3	172.16.0.4/31	172.16.0.4 – 172.16.0.5	172.16.0.5
4	172.16.0.6/31	172.16.0.6 – 172.16.0.7	172.16.0.7
5	172.16.0.8/31	172.16.0.8 – 172.16.0.9	172.16.0.9
6	172.16.0.10/31	172.16.0.10 – 172.16.0.11	172.16.0.11
7	172.16.0.12/31	172.16.0.12 – 172.16.0.13	172.16.0.13
8	172.16.0.14/31	172.16.0.14 – 172.16.0.15	172.16.0.15
9	172.16.0.16/31	172.16.0.16 – 172.16.0.17	172.16.0.17
10	172.16.0.18/31	172.16.0.18 – 172.16.0.19	172.16.0.19
11	172.16.0.20/31	172.16.0.20 – 172.16.0.21	172.16.0.21
12	172.16.0.22/31	172.16.0.22 – 172.16.0.23	172.16.0.23
13	172.16.0.24/31	172.16.0.24 – 172.16.0.25	172.16.0.25
14	172.16.0.26/31	172.16.0.26 – 172.16.0.27	172.16.0.27
15	172.16.0.28/31	172.16.0.28 – 172.16.0.29	172.16.0.29
16	172.16.0.30/31	172.16.0.30 – 172.16.0.31	172.16.0.31
17	172.16.0.32/31	172.16.0.32 – 172.16.0.33	172.16.0.33
18	172.16.0.34/31	172.16.0.34 – 172.16.0.35	172.16.0.35
19	172.16.0.36/31	172.16.0.36 – 172.16.0.37	172.16.0.37
20	172.16.0.38/31	172.16.0.38 – 172.16.0.39	172.16.0.39
21	172.16.0.40/31	172.16.0.40 – 172.16.0.41	172.16.0.41
22	172.16.0.42/31	172.16.0.42 – 172.16.0.43	172.16.0.43
23	172.16.0.44/31	172.16.0.44 – 172.16.0.45	172.16.0.45
24	172.16.0.46/31	172.16.0.46 – 172.16.0.47	172.16.0.47
25	172.16.0.48/31	172.16.0.48 – 172.16.0.49	172.16.0.49
26	172.16.0.50/31	172.16.0.50 – 172.16.0.51	172.16.0.51
27	172.16.0.52/31	172.16.0.52 – 172.16.0.53	172.16.0.53
28	172.16.0.54/31	172.16.0.54 – 172.16.0.55	172.16.0.55
29	172.16.0.56/31	172.16.0.56 – 172.16.0.57	172.16.0.57
30	172.16.0.58/31	172.16.0.58 – 172.16.0.59	172.16.0.59
31	172.16.0.60/31	172.16.0.60 – 172.16.0.61	172.16.0.61
32	172.16.0.62/31	172.16.0.62 – 172.16.0.63	172.16.0.63
33	172.16.0.64/31	172.16.0.64 – 172.16.0.65	172.16.0.65
34	172.16.0.66/31	172.16.0.66 – 172.16.0.67	172.16.0.67
35	172.16.0.68/31	172.16.0.68 – 172.16.0.69	172.16.0.69
36	172.16.0.70/31	172.16.0.70 – 172.16.0.71	172.16.0.71
37	172.16.0.72/31	172.16.0.72 – 172.16.0.73	172.16.0.73
38	172.16.0.74/31	172.16.0.74 – 172.16.0.75	172.16.0.75
39	172.16.0.76/31	172.16.0.76 – 172.16.0.77	172.16.0.77
40	172.16.0.78/31	172.16.0.78 – 172.16.0.79	172.16.0.79
41	172.16.0.80/31	172.16.0.80 – 172.16.0.81	172.16.0.81
42	172.16.0.82/31	172.16.0.82 – 172.16.0.83	172.16.0.83
43	172.16.0.84/31	172.16.0.84 – 172.16.0.85	172.16.0.85
44	172.16.0.86/31	172.16.0.86 – 172.16.0.87	172.16.0.87
45	172.16.0.88/31	172.16.0.88 – 172.16.0.89	172.16.0.89
46	172.16.0.90/31	172.16.0.90 – 172.16.0.91	172.16.0.91
47	172.16.0.92/31	172.16.0.92 – 172.16.0.93	172.16.0.93
48	172.16.0.94/31	172.16.0.94 – 172.16.0.95	172.16.0.95
49	172.16.0.96/31	172.16.0.96 – 172.16.0.97	172.16.0.97
50	172.16.0.98/31	172.16.0.98 – 172.16.0.99	172.16.0.99
51	172.16.0.100/31	172.16.0.100 – 172.16.0.101	172.16.0.101
52	172.16.0.102/31	172.16.0.102 – 172.16.0.103	172.16.0.103
53	172.16.0.104/31	172.16.0.104 – 172.16.0.105	172.16.0.105
54	172.16.0.106/31	172.16.0.106 – 172.16.0.107	172.16.0.107
55	172.16.0.108/31	172.16.0.108 – 172.16.0.109	172.16.0.109
56	172.16.0.110/31	172.16.0.110 – 172.16.0.111	172.16.0.111
57	172.16.0.112/31	172.16.0.112 – 172.16.0.113	172.16.0.113
58	172.16.0.114/31	172.16.0.114 – 172.16.0.115	172.16.0.115
59	172.16.0.116/31	172.16.0.116 – 172.16.0.117	172.16.0.117
60	172.16.0.118/31	172.16.0.118 – 172.16.0.119	172.16.0.119
61	172.16.0.120/31	172.16.0.120 – 172.16.0.121	172.16.0.121
62	172.16.0.122/31	172.16.0.122 – 172.16.0.123	172.16.0.123
63	172.16.0.124/31	172.16.0.124 – 172.16.0.125	172.16.0.125
64	172.16.0.126/31	172.16.0.126 – 172.16.0.127	172.16.0.127
65	172.16.0.128/31	172.16.0.128 – 172.16.0.129	172.16.0.129
66	172.16.0.130/31	172.16.0.130 – 172.16.0.131	172.16.0.131
67	172.16.0.132/31	172.16.0.132 – 172.16.0.133	172.16.0.133
68	172.16.0.134/31	172.16.0.134 – 172.16.0.135	172.16.0.135
69	172.16.0.136/31	172.16.0.136 – 172.16.0.137	172.16.0.137
70	172.16.0.138/31	172.16.0.138 – 172.16.0.139	172.16.0.139
71	172.16.0.140/31	172.16.0.140 – 172.16.0.141	172.16.0.141
72	172.16.0.142/31	172.16.0.142 – 172.16.0.143	172.16.0.143
73	172.16.0.144/31	172.16.0.144 – 172.16.0.145	172.16.0.145
74	172.16.0.146/31	172.16.0.146 – 172.16.0.147	172.16.0.147
75	172.16.0.148/31	172.16.0.148 – 172.16.0.149	172.16.0.149
76	172.16.0.150/31	172.16.0.150 – 172.16.0.151	172.16.0.151
77	172.16.0.152/31	172.16.0.152 – 172.16.0.153	172.16.0.153
78	172.16.0.154/31	172.16.0.154 – 172.16.0.155	172.16.0.155
79	172.16.0.156/31	172.16.0.156 – 172.16.0.157	172.16.0.157
80	172.16.0.158/31	172.16.0.158 – 172.16.0.159	172.16.0.159
81	172.16.0.160/31	172.16.0.160 – 172.16.0.161	172.16.0.161
82	172.16.0.162/31	172.16.0.162 – 172.16.0.163	172.16.0.163
83	172.16.0.164/31	172.16.0.164 – 172.16.0.165	172.16.0.165
84	172.16.0.166/31	172.16.0.166 – 172.16.0.167	172.16.0.167
85	172.16.0.168/31	172.16.0.168 – 172.16.0.169	172.16.0.169
86	172.16.0.170/31	172.16.0.170 – 172.16.0.171	172.16.0.171
87	172.16.0.172/31	172.16.0.172 – 172.16.0.173	172.16.0.173
88	172.16.0.174/31	172.16.0.174 – 172.16.0.175	172.16.0.175
89	172.16.0.176/31	172.16.0.176 – 172.16.0.177	172.16.0.177
90	172.16.0.178/31	172.16.0.178 – 172.16.0.179	172.16.0.179
91	172.16.0.180/31	172.16.0.180 – 172.16.0.181	172.16.0.181
92	172.16.0.182/31	172.16.0.182 – 172.16.0.183	172.16.0.183
93	172.16.0.184/31	172.16.0.184 – 172.16.0.185	172.16.0.185
94	172.16.0.186/31	172.16.0.186 – 172.16.0.187	172.16.0.187
95	172.16.0.188/31	172.16.0.188 – 172.16.0.189	172.16.0.189
96	172.16.0.190/31	172.16.0.190 – 172.16.0.191	172.16.0.191
97	172.16.0.192/31	172.16.0.192 – 172.16.0.193	172.16.0.193
98	172.16.0.194/31	172.16.0.194 – 172.16.0.195	172.16.0.195
99	172.16.0.196/31	172.16.0.196 – 172.16.0.197	172.16.0.197
100	172.16.0.198/31	172.16.0.198 – 172.16.0.199	172.16.0.199
101	172.16.0.200/31	172.16.0.200 – 172.16.0.201	172.16.0.201
102	172.16.0.202/31	172.16.0.202 – 172.16.0.203	172.16.0.203
103	172.16.0.204/31	172.16.0.204 – 172.16.0.205	172.16.0.205
104	172.16.0.206/31	172.16.0.206 – 172.16.0.207	172.16.0.207
105	172.16.0.208/31	172.16.0.208 – 172.16.0.209	172.16.0.209
106	172.16.0.210/31	172.16.0.210 – 172.16.0.211	172.16.0.211
107	172.16.0.212/31	172.16.0.212 – 172.16.0.213	172.16.0.213
108	172.16.0.214/31	172.16.0.214 – 172.16.0.215	172.16.0.215
109	172.16.0.216/31	172.16.0.216 – 172.16.0.217	172.16.0.217
110	172.16.0.218/31	172.16.0.218 – 172.16.0.219	172.16.0.219
111	172.16.0.220/31	172.16.0.220 – 172.16.0.221	172.16.0.221
112	172.16.0.222/31	172.16.0.222 – 172.16.0.223	172.16.0.223
113	172.16.0.224/31	172.16.0.224 – 172.16.0.225	172.16.0.225
114	172.16.0.226/31	172.16.0.226 – 172.16.0.227	172.16.0.227
115	172.16.0.228/31	172.16.0.228 – 172.16.0.229	172.16.0.229
116	172.16.0.230/31	172.16.0.230 – 172.16.0.231	172.16.0.231
117	172.16.0.232/31	172.16.0.232 – 172.16.0.233	172.16.0.233
118	172.16.0.234/31	172.16.0.234 – 172.16.0.235	172.16.0.235
119	172.16.0.236/31	172.16.0.236 – 172.16.0.237	172.16.0.237
120	172.16.0.238/31	172.16.0.238 – 172.16.0.239	172.16.0.239
121	172.16.0.240/31	172.16.0.240 – 172.16.0.241	172.16.0.241
122	172.16.0.242/31	172.16.0.242 – 172.16.0.243	172.16.0.243
123	172.16.0.244/31	172.16.0.244 – 172.16.0.245	172.16.0.245
124	172.16.0.246/31	172.16.0.246 – 172.16.0.247	172.16.0.247
125	172.16.0.248/31	172.16.0.248 – 172.16.0.249	172.16.0.249
126	172.16.0.250/31	172.16.0.250 – 172.16.0.251	172.16.0.251
127	172.16.0.252/31	172.16.0.252 – 172.16.0.253	172.16.0.253
128	172.16.0.254/31	172.16.0.254 – 172.16.0.255	172.16.0.255
129	172.16.1.0/31	172.16.1.0 – 172.16.1.1	172.16.1.1
130	172.16.1.2/31	172.16.1.2 – 172.16.1.3	172.16.1.3
131	172.16.1.4/31	172.16.1.4 – 172.16.1.5	172.16.1.5
132	172.16.1.6/31	172.16.1.6 – 172.16.1.7	172.16.1.7
133	172.16.1.8/31	172.16.1.8 – 172.16.1.9	172.16.1.9
134	172.16.1.10/31	172.16.1.10 – 172.16.1.11	172.16.1.11
135	172.16.1.12/31	172.16.1.12 – 172.16.1.13	172.16.1.13
136	172.16.1.14/31	172.16.1.14 – 172.16.1.15	172.16.1.15
137	172.16.1.16/31	172.16.1.16 – 172.16.1.17	172.16.1.17
138	172.16.1.18/31	172.16.1.18 – 172.16.1.19	172.16.1.19
139	172.16.1.20/31	172.16.1.20 – 172.16.1.21	172.16.1.21
140	172.16.1.22/31	172.16.1.22 – 172.16.1.23	172.16.1.23
141	172.16.1.24/31	172.16.1.24 – 172.16.1.25	172.16.1.25
142	172.16.1.26/31	172.16.1.26 – 172.16.1.27	172.16.1.27
143	172.16.1.28/31	172.16.1.28 – 172.16.1.29	172.16.1.29
144	172.16.1.30/31	172.16.1.30 – 172.16.1.31	172.16.1.31
145	172.16.1.32/31	172.16.1.32 – 172.16.1.33	172.16.1.33
146	172.16.1.34/31	172.16.1.34 – 172.16.1.35	172.16.1.35
147	172.16.1.36/31	172.16.1.36 – 172.16.1.37	172.16.1.37
148	172.16.1.38/31	172.16.1.38 – 172.16.1.39	172.16.1.39
149	172.16.1.40/31	172.16.1.40 – 172.16.1.41	172.16.1.41
150	172.16.1.42/31	172.16.1.42 – 172.16.1.43	172.16.1.43
151	172.16.1.44/31	172.16.1.44 – 172.16.1.45	172.16.1.45
152	172.16.1.46/31	172.16.1.46 – 172.16.1.47	172.16.1.47
153	172.16.1.48/31	172.16.1.48 – 172.16.1.49	172.16.1.49
154	172.16.1.50/31	172.16.1.50 – 172.16.1.51	172.16.1.51
155	172.16.1.52/31	172.16.1.52 – 172.16.1.53	172.16.1.53
156	172.16.1.54/31	172.16.1.54 – 172.16.1.55	172.16.1.55
157	172.16.1.56/31	172.16.1.56 – 172.16.1.57	172.16.1.57
158	172.16.1.58/31	172.16.1.58 – 172.16.1.59	172.16.1.59
159	172.16.1.60/31	172.16.1.60 – 172.16.1.61	172.16.1.61
160	172.16.1.62/31	172.16.1.62 – 172.16.1.63	172.16.1.63
161	172.16.1.64/31	172.16.1.64 – 172.16.1.65	172.16.1.65
162	172.16.1.66/31	172.16.1.66 – 172.16.1.67	172.16.1.67
163	172.16.1.68/31	172.16.1.68 – 172.16.1.69	172.16.1.69
164	172.16.1.70/31	172.16.1.70 – 172.16.1.71	172.16.1.71
165	172.16.1.72/31	172.16.1.72 – 172.16.1.73	172.16.1.73
166	172.16.1.74/31	172.16.1.74 – 172.16.1.75	172.16.1.75
167	172.16.1.76/31	172.16.1.76 – 172.16.1.77	172.16.1.77
168	172.16.1.78/31	172.16.1.78 – 172.16.1.79	172.16.1.79
169	172.16.1.80/31	172.16.1.80 – 172.16.1.81	172.16.1.81
170	172.16.1.82/31	172.16.1.82 – 172.16.1.83	172.16.1.83
171	172.16.1.84/31	172.16.1.84 – 172.16.1.85	172.16.1.85
172	172.16.1.86/31	172.16.1.86 – 172.16.1.87	172.16.1.87
173	172.16.1.88/31	172.16.1.88 – 172.16.1.89	172.16.1.89
174	172.16.1.90/31	172.16.1.90 – 172.16.1.91	172.16.1.91
175	172.16.1.92/31	172.16.1.92 – 172.16.1.93	172.16.1.93
176	172.16.1.94/31	172.16.1.94 – 172.16.1.95	172.16.1.95
177	172.16.1.96/31	172.16.1.96 – 172.16.1.97	172.16.1.97
178	172.16.1.98/31	172.16.1.98 – 172.16.1.99	172.16.1.99
179	172.16.1.100/31	172.16.1.100 – 172.16.1.101	172.16.1.101
180	172.16.1.102/31	172.16.1.102 – 172.16.1.103	172.16.1.103
181	172.16.1.104/31	172.16.1.104 – 172.16.1.105	172.16.1.105
182	172.16.1.106/31	172.16.1.106 – 172.16.1.107	172.16.1.107
183	172.16.1.108/31	172.16.1.108 – 172.16.1.109	172.16.1.109
184	172.16.1.110/31	172.16.1.110 – 172.16.1.111	172.16.1.111
185	172.16.1.112/31	172.16.1.112 – 172.16.1.113	172.16.1.113
186	172.16.1.114/31	172.16.1.114 – 172.16.1.115	172.16.1.115
187	172.16.1.116/31	172.16.1.116 – 172.16.1.117	172.16.1.117
188	172.16.1.118/31	172.16.1.118 – 172.16.1.119	172.16.1.119
189	172.16.1.120/31	172.16.1.120 – 172.16.1.121	172.16.1.121
190	172.16.1.122/31	172.16.1.122 – 172.16.1.123	172.16.1.123
191	172.16.1.124/31	172.16.1.124 – 172.16.1.125	172.16.1.125
192	172.16.1.126/31	172.16.1.126 – 172.16.1.127	172.16.1.127
193	172.16.1.128/31	172.16.1.128 – 172.16.1.129	172.16.1.129
194	172.16.1.130/31	172.16.1.130 – 172.16.1.131	172.16.1.131
195	172.16.1.132/31	172.16.1.132 – 172.16.1.133	172.16.1.133
196	172.16.1.134/31	172.16.1.134 – 172.16.1.135	172.16.1.135
197	172.16.1.136/31	172.16.1.136 – 172.16.1.137	172.16.1.137
198	172.16.1.138/31	172.16.1.138 – 172.16.1.139	172.16.1.139
199	172.16.1.140/31	172.16.1.140 – 172.16.1.141	172.16.1.141
200	172.16.1.142/31	172.16.1.142 – 172.16.1.143	172.16.1.143
201	172.16.1.144/31	172.16.1.144 – 172.16.1.145	172.16.1.145
202	172.16.1.146/31	172.16.1.146 – 172.16.1.147	172.16.1.147
203	172.16.1.148/31	172.16.1.148 – 172.16.1.149	172.16.1.149
204	172.16.1.150/31	172.16.1.150 – 172.16.1.151	172.16.1.151
205	172.16.1.152/31	172.16.1.152 – 172.16.1.153	172.16.1.153
206	172.16.1.154/31	172.16.1.154 – 172.16.1.155	172.16.1.155
207	172.16.1.156/31	172.16.1.156 – 172.16.1.157	172.16.1.157
208	172.16.1.158/31	172.16.1.158 – 172.16.1.159	172.16.1.159
209	172.16.1.160/31	172.16.1.160 – 172.16.1.161	172.16.1.161
210	172.16.1.162/31	172.16.1.162 – 172.16.1.163	172.16.1.163
211	172.16.1.164/31	172.16.1.164 – 172.16.1.165	172.16.1.165
212	172.16.1.166/31	172.16.1.166 – 172.16.1.167	172.16.1.167
213	172.16.1.168/31	172.16.1.168 – 172.16.1.169	172.16.1.169
214	172.16.1.170/31	172.16.1.170 – 172.16.1.171	172.16.1.171
215	172.16.1.172/31	172.16.1.172 – 172.16.1.173	172.16.1.173
216	172.16.1.174/31	172.16.1.174 – 172.16.1.175	172.16.1.175
217	172.16.1.176/31	172.16.1.176 – 172.16.1.177	172.16.1.177
218	172.16.1.178/31	172.16.1.178 – 172.16.1.179	172.16.1.179
219	172.16.1.180/31	172.16.1.180 – 172.16.1.181	172.16.1.181
220	172.16.1.182/31	172.16.1.182 – 172.16.1.183	172.16.1.183
221	172.16.1.184/31	172.16.1.184 – 172.16.1.185	172.16.1.185
222	172.16.1.186/31	172.16.1.186 – 172.16.1.187	172.16.1.187
223	172.16.1.188/31	172.16.1.188 – 172.16.1.189	172.16.1.189
224	172.16.1.190/31	172.16.1.190 – 172.16.1.191	172.16.1.191
225	172.16.1.192/31	172.16.1.192 – 172.16.1.193	172.16.1.193
226	172.16.1.194/31	172.16.1.194 – 172.16.1.195	172.16.1.195
227	172.16.1.196/31	172.16.1.196 – 172.16.1.197	172.16.1.197
228	172.16.1.198/31	172.16.1.198 – 172.16.1.199	172.16.1.199
229	172.16.1.200/31	172.16.1.200 – 172.16.1.201	172.16.1.201
230	172.16.1.202/31	172.16.1.202 – 172.16.1.203	172.16.1.203
231	172.16.1.204/31	172.16.1.204 – 172.16.1.205	172.16.1.205
232	172.16.1.206/31	172.16.1.206 – 172.16.1.207	172.16.1.207
233	172.16.1.208/31	172.16.1.208 – 172.16.1.209	172.16.1.209
234	172.16.1.210/31	172.16.1.210 – 172.16.1.211	172.16.1.211
235	172.16.1.212/31	172.16.1.212 – 172.16.1.213	172.16.1.213
236	172.16.1.214/31	172.16.1.214 – 172.16.1.215	172.16.1.215
237	172.16.1.216/31	172.16.1.216 – 172.16.1.217	172.16.1.217
238	172.16.1.218/31	172.16.1.218 – 172.16.1.219	172.16.1.219
239	172.16.1.220/31	172.16.1.220 – 172.16.1.221	172.16.1.221
240	172.16.1.222/31	172.16.1.222 – 172.16.1.223	172.16.1.223
241	172.16.1.224/31	172.16.1.224 – 172.16.1.225	172.16.1.225
242	172.16.1.226/31	172.16.1.226 – 172.16.1.227	172.16.1.227
243	172.16.1.228/31	172.16.1.228 – 172.16.1.229	172.16.1.229
244	172.16.1.230/31	172.16.1.230 – 172.16.1.231	172.16.1.231
245	172.16.1.232/31	172.16.1.232 – 172.16.1.233	172.16.1.233
246	172.16.1.234/31	172.16.1.234 – 172.16.1.235	172.16.1.235
247	172.16.1.236/31	172.16.1.236 – 172.16.1.237	172.16.1.237
248	172.16.1.238/31	172.16.1.238 – 172.16.1.239	172.16.1.239
249	172.16.1.240/31	172.16.1.240 – 172.16.1.241	172.16.1.241
250	172.16.1.242/31	172.16.1.242 – 172.16.1.243	172.16.1.243
251	172.16.1.244/31	172.16.1.244 – 172.16.1.245	172.16.1.245
252	172.16.1.246/31	172.16.1.246 – 172.16.1.247	172.16.1.247
253	172.16.1.248/31	172.16.1.248 – 172.16.1.249	172.16.1.249
254	172.16.1.250/31	172.16.1.250 – 172.16.1.251	172.16.1.251
255	172.16.1.252/31	172.16.1.252 – 172.16.1.253	172.16.1.253
256	172.16.1.254/31	172.16.1.254 – 172.16.1.255	172.16.1.255

showing 256 of 2,048

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /20
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	1
/21	255.255.248.0	2,048	2,046	2 split →
/22	255.255.252.0	1,024	1,022	4 split →
/23	255.255.254.0	512	510	8 split →
/24	255.255.255.0	256	254	16 split →
/25	255.255.255.128	128	126	32 split →
/26	255.255.255.192	64	62	64 split →
/27	255.255.255.224	32	30	128 split →
/28	255.255.255.240	16	14	256 split →
/29	255.255.255.248	8	6	512 split →
/30	255.255.255.252	4	2	1,024 split →
/31	255.255.255.254	2	2	2,048 split →
/32	255.255.255.255	1	1	4,096 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →