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)10.17.32.0/19

network10.17.32.0/19

broadcast10.17.63.255

first host10.17.32.1

last host10.17.63.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.17.32.0/19

address00001010.00010001.00100000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010001.00100000.00000000

broadcast00001010.00010001.00111111.11111111

green = network part, grey = host part

hex0x0a112000

decimal168894464

reverse dns0.32.17.10.in-addr.arpa

ipv4-mapped::ffff:a11:2000

/19 split into /31 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.17.32.0/31	10.17.32.0 – 10.17.32.1	10.17.32.1
2	10.17.32.2/31	10.17.32.2 – 10.17.32.3	10.17.32.3
3	10.17.32.4/31	10.17.32.4 – 10.17.32.5	10.17.32.5
4	10.17.32.6/31	10.17.32.6 – 10.17.32.7	10.17.32.7
5	10.17.32.8/31	10.17.32.8 – 10.17.32.9	10.17.32.9
6	10.17.32.10/31	10.17.32.10 – 10.17.32.11	10.17.32.11
7	10.17.32.12/31	10.17.32.12 – 10.17.32.13	10.17.32.13
8	10.17.32.14/31	10.17.32.14 – 10.17.32.15	10.17.32.15
9	10.17.32.16/31	10.17.32.16 – 10.17.32.17	10.17.32.17
10	10.17.32.18/31	10.17.32.18 – 10.17.32.19	10.17.32.19
11	10.17.32.20/31	10.17.32.20 – 10.17.32.21	10.17.32.21
12	10.17.32.22/31	10.17.32.22 – 10.17.32.23	10.17.32.23
13	10.17.32.24/31	10.17.32.24 – 10.17.32.25	10.17.32.25
14	10.17.32.26/31	10.17.32.26 – 10.17.32.27	10.17.32.27
15	10.17.32.28/31	10.17.32.28 – 10.17.32.29	10.17.32.29
16	10.17.32.30/31	10.17.32.30 – 10.17.32.31	10.17.32.31
17	10.17.32.32/31	10.17.32.32 – 10.17.32.33	10.17.32.33
18	10.17.32.34/31	10.17.32.34 – 10.17.32.35	10.17.32.35
19	10.17.32.36/31	10.17.32.36 – 10.17.32.37	10.17.32.37
20	10.17.32.38/31	10.17.32.38 – 10.17.32.39	10.17.32.39
21	10.17.32.40/31	10.17.32.40 – 10.17.32.41	10.17.32.41
22	10.17.32.42/31	10.17.32.42 – 10.17.32.43	10.17.32.43
23	10.17.32.44/31	10.17.32.44 – 10.17.32.45	10.17.32.45
24	10.17.32.46/31	10.17.32.46 – 10.17.32.47	10.17.32.47
25	10.17.32.48/31	10.17.32.48 – 10.17.32.49	10.17.32.49
26	10.17.32.50/31	10.17.32.50 – 10.17.32.51	10.17.32.51
27	10.17.32.52/31	10.17.32.52 – 10.17.32.53	10.17.32.53
28	10.17.32.54/31	10.17.32.54 – 10.17.32.55	10.17.32.55
29	10.17.32.56/31	10.17.32.56 – 10.17.32.57	10.17.32.57
30	10.17.32.58/31	10.17.32.58 – 10.17.32.59	10.17.32.59
31	10.17.32.60/31	10.17.32.60 – 10.17.32.61	10.17.32.61
32	10.17.32.62/31	10.17.32.62 – 10.17.32.63	10.17.32.63
33	10.17.32.64/31	10.17.32.64 – 10.17.32.65	10.17.32.65
34	10.17.32.66/31	10.17.32.66 – 10.17.32.67	10.17.32.67
35	10.17.32.68/31	10.17.32.68 – 10.17.32.69	10.17.32.69
36	10.17.32.70/31	10.17.32.70 – 10.17.32.71	10.17.32.71
37	10.17.32.72/31	10.17.32.72 – 10.17.32.73	10.17.32.73
38	10.17.32.74/31	10.17.32.74 – 10.17.32.75	10.17.32.75
39	10.17.32.76/31	10.17.32.76 – 10.17.32.77	10.17.32.77
40	10.17.32.78/31	10.17.32.78 – 10.17.32.79	10.17.32.79
41	10.17.32.80/31	10.17.32.80 – 10.17.32.81	10.17.32.81
42	10.17.32.82/31	10.17.32.82 – 10.17.32.83	10.17.32.83
43	10.17.32.84/31	10.17.32.84 – 10.17.32.85	10.17.32.85
44	10.17.32.86/31	10.17.32.86 – 10.17.32.87	10.17.32.87
45	10.17.32.88/31	10.17.32.88 – 10.17.32.89	10.17.32.89
46	10.17.32.90/31	10.17.32.90 – 10.17.32.91	10.17.32.91
47	10.17.32.92/31	10.17.32.92 – 10.17.32.93	10.17.32.93
48	10.17.32.94/31	10.17.32.94 – 10.17.32.95	10.17.32.95
49	10.17.32.96/31	10.17.32.96 – 10.17.32.97	10.17.32.97
50	10.17.32.98/31	10.17.32.98 – 10.17.32.99	10.17.32.99
51	10.17.32.100/31	10.17.32.100 – 10.17.32.101	10.17.32.101
52	10.17.32.102/31	10.17.32.102 – 10.17.32.103	10.17.32.103
53	10.17.32.104/31	10.17.32.104 – 10.17.32.105	10.17.32.105
54	10.17.32.106/31	10.17.32.106 – 10.17.32.107	10.17.32.107
55	10.17.32.108/31	10.17.32.108 – 10.17.32.109	10.17.32.109
56	10.17.32.110/31	10.17.32.110 – 10.17.32.111	10.17.32.111
57	10.17.32.112/31	10.17.32.112 – 10.17.32.113	10.17.32.113
58	10.17.32.114/31	10.17.32.114 – 10.17.32.115	10.17.32.115
59	10.17.32.116/31	10.17.32.116 – 10.17.32.117	10.17.32.117
60	10.17.32.118/31	10.17.32.118 – 10.17.32.119	10.17.32.119
61	10.17.32.120/31	10.17.32.120 – 10.17.32.121	10.17.32.121
62	10.17.32.122/31	10.17.32.122 – 10.17.32.123	10.17.32.123
63	10.17.32.124/31	10.17.32.124 – 10.17.32.125	10.17.32.125
64	10.17.32.126/31	10.17.32.126 – 10.17.32.127	10.17.32.127
65	10.17.32.128/31	10.17.32.128 – 10.17.32.129	10.17.32.129
66	10.17.32.130/31	10.17.32.130 – 10.17.32.131	10.17.32.131
67	10.17.32.132/31	10.17.32.132 – 10.17.32.133	10.17.32.133
68	10.17.32.134/31	10.17.32.134 – 10.17.32.135	10.17.32.135
69	10.17.32.136/31	10.17.32.136 – 10.17.32.137	10.17.32.137
70	10.17.32.138/31	10.17.32.138 – 10.17.32.139	10.17.32.139
71	10.17.32.140/31	10.17.32.140 – 10.17.32.141	10.17.32.141
72	10.17.32.142/31	10.17.32.142 – 10.17.32.143	10.17.32.143
73	10.17.32.144/31	10.17.32.144 – 10.17.32.145	10.17.32.145
74	10.17.32.146/31	10.17.32.146 – 10.17.32.147	10.17.32.147
75	10.17.32.148/31	10.17.32.148 – 10.17.32.149	10.17.32.149
76	10.17.32.150/31	10.17.32.150 – 10.17.32.151	10.17.32.151
77	10.17.32.152/31	10.17.32.152 – 10.17.32.153	10.17.32.153
78	10.17.32.154/31	10.17.32.154 – 10.17.32.155	10.17.32.155
79	10.17.32.156/31	10.17.32.156 – 10.17.32.157	10.17.32.157
80	10.17.32.158/31	10.17.32.158 – 10.17.32.159	10.17.32.159
81	10.17.32.160/31	10.17.32.160 – 10.17.32.161	10.17.32.161
82	10.17.32.162/31	10.17.32.162 – 10.17.32.163	10.17.32.163
83	10.17.32.164/31	10.17.32.164 – 10.17.32.165	10.17.32.165
84	10.17.32.166/31	10.17.32.166 – 10.17.32.167	10.17.32.167
85	10.17.32.168/31	10.17.32.168 – 10.17.32.169	10.17.32.169
86	10.17.32.170/31	10.17.32.170 – 10.17.32.171	10.17.32.171
87	10.17.32.172/31	10.17.32.172 – 10.17.32.173	10.17.32.173
88	10.17.32.174/31	10.17.32.174 – 10.17.32.175	10.17.32.175
89	10.17.32.176/31	10.17.32.176 – 10.17.32.177	10.17.32.177
90	10.17.32.178/31	10.17.32.178 – 10.17.32.179	10.17.32.179
91	10.17.32.180/31	10.17.32.180 – 10.17.32.181	10.17.32.181
92	10.17.32.182/31	10.17.32.182 – 10.17.32.183	10.17.32.183
93	10.17.32.184/31	10.17.32.184 – 10.17.32.185	10.17.32.185
94	10.17.32.186/31	10.17.32.186 – 10.17.32.187	10.17.32.187
95	10.17.32.188/31	10.17.32.188 – 10.17.32.189	10.17.32.189
96	10.17.32.190/31	10.17.32.190 – 10.17.32.191	10.17.32.191
97	10.17.32.192/31	10.17.32.192 – 10.17.32.193	10.17.32.193
98	10.17.32.194/31	10.17.32.194 – 10.17.32.195	10.17.32.195
99	10.17.32.196/31	10.17.32.196 – 10.17.32.197	10.17.32.197
100	10.17.32.198/31	10.17.32.198 – 10.17.32.199	10.17.32.199
101	10.17.32.200/31	10.17.32.200 – 10.17.32.201	10.17.32.201
102	10.17.32.202/31	10.17.32.202 – 10.17.32.203	10.17.32.203
103	10.17.32.204/31	10.17.32.204 – 10.17.32.205	10.17.32.205
104	10.17.32.206/31	10.17.32.206 – 10.17.32.207	10.17.32.207
105	10.17.32.208/31	10.17.32.208 – 10.17.32.209	10.17.32.209
106	10.17.32.210/31	10.17.32.210 – 10.17.32.211	10.17.32.211
107	10.17.32.212/31	10.17.32.212 – 10.17.32.213	10.17.32.213
108	10.17.32.214/31	10.17.32.214 – 10.17.32.215	10.17.32.215
109	10.17.32.216/31	10.17.32.216 – 10.17.32.217	10.17.32.217
110	10.17.32.218/31	10.17.32.218 – 10.17.32.219	10.17.32.219
111	10.17.32.220/31	10.17.32.220 – 10.17.32.221	10.17.32.221
112	10.17.32.222/31	10.17.32.222 – 10.17.32.223	10.17.32.223
113	10.17.32.224/31	10.17.32.224 – 10.17.32.225	10.17.32.225
114	10.17.32.226/31	10.17.32.226 – 10.17.32.227	10.17.32.227
115	10.17.32.228/31	10.17.32.228 – 10.17.32.229	10.17.32.229
116	10.17.32.230/31	10.17.32.230 – 10.17.32.231	10.17.32.231
117	10.17.32.232/31	10.17.32.232 – 10.17.32.233	10.17.32.233
118	10.17.32.234/31	10.17.32.234 – 10.17.32.235	10.17.32.235
119	10.17.32.236/31	10.17.32.236 – 10.17.32.237	10.17.32.237
120	10.17.32.238/31	10.17.32.238 – 10.17.32.239	10.17.32.239
121	10.17.32.240/31	10.17.32.240 – 10.17.32.241	10.17.32.241
122	10.17.32.242/31	10.17.32.242 – 10.17.32.243	10.17.32.243
123	10.17.32.244/31	10.17.32.244 – 10.17.32.245	10.17.32.245
124	10.17.32.246/31	10.17.32.246 – 10.17.32.247	10.17.32.247
125	10.17.32.248/31	10.17.32.248 – 10.17.32.249	10.17.32.249
126	10.17.32.250/31	10.17.32.250 – 10.17.32.251	10.17.32.251
127	10.17.32.252/31	10.17.32.252 – 10.17.32.253	10.17.32.253
128	10.17.32.254/31	10.17.32.254 – 10.17.32.255	10.17.32.255
129	10.17.33.0/31	10.17.33.0 – 10.17.33.1	10.17.33.1
130	10.17.33.2/31	10.17.33.2 – 10.17.33.3	10.17.33.3
131	10.17.33.4/31	10.17.33.4 – 10.17.33.5	10.17.33.5
132	10.17.33.6/31	10.17.33.6 – 10.17.33.7	10.17.33.7
133	10.17.33.8/31	10.17.33.8 – 10.17.33.9	10.17.33.9
134	10.17.33.10/31	10.17.33.10 – 10.17.33.11	10.17.33.11
135	10.17.33.12/31	10.17.33.12 – 10.17.33.13	10.17.33.13
136	10.17.33.14/31	10.17.33.14 – 10.17.33.15	10.17.33.15
137	10.17.33.16/31	10.17.33.16 – 10.17.33.17	10.17.33.17
138	10.17.33.18/31	10.17.33.18 – 10.17.33.19	10.17.33.19
139	10.17.33.20/31	10.17.33.20 – 10.17.33.21	10.17.33.21
140	10.17.33.22/31	10.17.33.22 – 10.17.33.23	10.17.33.23
141	10.17.33.24/31	10.17.33.24 – 10.17.33.25	10.17.33.25
142	10.17.33.26/31	10.17.33.26 – 10.17.33.27	10.17.33.27
143	10.17.33.28/31	10.17.33.28 – 10.17.33.29	10.17.33.29
144	10.17.33.30/31	10.17.33.30 – 10.17.33.31	10.17.33.31
145	10.17.33.32/31	10.17.33.32 – 10.17.33.33	10.17.33.33
146	10.17.33.34/31	10.17.33.34 – 10.17.33.35	10.17.33.35
147	10.17.33.36/31	10.17.33.36 – 10.17.33.37	10.17.33.37
148	10.17.33.38/31	10.17.33.38 – 10.17.33.39	10.17.33.39
149	10.17.33.40/31	10.17.33.40 – 10.17.33.41	10.17.33.41
150	10.17.33.42/31	10.17.33.42 – 10.17.33.43	10.17.33.43
151	10.17.33.44/31	10.17.33.44 – 10.17.33.45	10.17.33.45
152	10.17.33.46/31	10.17.33.46 – 10.17.33.47	10.17.33.47
153	10.17.33.48/31	10.17.33.48 – 10.17.33.49	10.17.33.49
154	10.17.33.50/31	10.17.33.50 – 10.17.33.51	10.17.33.51
155	10.17.33.52/31	10.17.33.52 – 10.17.33.53	10.17.33.53
156	10.17.33.54/31	10.17.33.54 – 10.17.33.55	10.17.33.55
157	10.17.33.56/31	10.17.33.56 – 10.17.33.57	10.17.33.57
158	10.17.33.58/31	10.17.33.58 – 10.17.33.59	10.17.33.59
159	10.17.33.60/31	10.17.33.60 – 10.17.33.61	10.17.33.61
160	10.17.33.62/31	10.17.33.62 – 10.17.33.63	10.17.33.63
161	10.17.33.64/31	10.17.33.64 – 10.17.33.65	10.17.33.65
162	10.17.33.66/31	10.17.33.66 – 10.17.33.67	10.17.33.67
163	10.17.33.68/31	10.17.33.68 – 10.17.33.69	10.17.33.69
164	10.17.33.70/31	10.17.33.70 – 10.17.33.71	10.17.33.71
165	10.17.33.72/31	10.17.33.72 – 10.17.33.73	10.17.33.73
166	10.17.33.74/31	10.17.33.74 – 10.17.33.75	10.17.33.75
167	10.17.33.76/31	10.17.33.76 – 10.17.33.77	10.17.33.77
168	10.17.33.78/31	10.17.33.78 – 10.17.33.79	10.17.33.79
169	10.17.33.80/31	10.17.33.80 – 10.17.33.81	10.17.33.81
170	10.17.33.82/31	10.17.33.82 – 10.17.33.83	10.17.33.83
171	10.17.33.84/31	10.17.33.84 – 10.17.33.85	10.17.33.85
172	10.17.33.86/31	10.17.33.86 – 10.17.33.87	10.17.33.87
173	10.17.33.88/31	10.17.33.88 – 10.17.33.89	10.17.33.89
174	10.17.33.90/31	10.17.33.90 – 10.17.33.91	10.17.33.91
175	10.17.33.92/31	10.17.33.92 – 10.17.33.93	10.17.33.93
176	10.17.33.94/31	10.17.33.94 – 10.17.33.95	10.17.33.95
177	10.17.33.96/31	10.17.33.96 – 10.17.33.97	10.17.33.97
178	10.17.33.98/31	10.17.33.98 – 10.17.33.99	10.17.33.99
179	10.17.33.100/31	10.17.33.100 – 10.17.33.101	10.17.33.101
180	10.17.33.102/31	10.17.33.102 – 10.17.33.103	10.17.33.103
181	10.17.33.104/31	10.17.33.104 – 10.17.33.105	10.17.33.105
182	10.17.33.106/31	10.17.33.106 – 10.17.33.107	10.17.33.107
183	10.17.33.108/31	10.17.33.108 – 10.17.33.109	10.17.33.109
184	10.17.33.110/31	10.17.33.110 – 10.17.33.111	10.17.33.111
185	10.17.33.112/31	10.17.33.112 – 10.17.33.113	10.17.33.113
186	10.17.33.114/31	10.17.33.114 – 10.17.33.115	10.17.33.115
187	10.17.33.116/31	10.17.33.116 – 10.17.33.117	10.17.33.117
188	10.17.33.118/31	10.17.33.118 – 10.17.33.119	10.17.33.119
189	10.17.33.120/31	10.17.33.120 – 10.17.33.121	10.17.33.121
190	10.17.33.122/31	10.17.33.122 – 10.17.33.123	10.17.33.123
191	10.17.33.124/31	10.17.33.124 – 10.17.33.125	10.17.33.125
192	10.17.33.126/31	10.17.33.126 – 10.17.33.127	10.17.33.127
193	10.17.33.128/31	10.17.33.128 – 10.17.33.129	10.17.33.129
194	10.17.33.130/31	10.17.33.130 – 10.17.33.131	10.17.33.131
195	10.17.33.132/31	10.17.33.132 – 10.17.33.133	10.17.33.133
196	10.17.33.134/31	10.17.33.134 – 10.17.33.135	10.17.33.135
197	10.17.33.136/31	10.17.33.136 – 10.17.33.137	10.17.33.137
198	10.17.33.138/31	10.17.33.138 – 10.17.33.139	10.17.33.139
199	10.17.33.140/31	10.17.33.140 – 10.17.33.141	10.17.33.141
200	10.17.33.142/31	10.17.33.142 – 10.17.33.143	10.17.33.143
201	10.17.33.144/31	10.17.33.144 – 10.17.33.145	10.17.33.145
202	10.17.33.146/31	10.17.33.146 – 10.17.33.147	10.17.33.147
203	10.17.33.148/31	10.17.33.148 – 10.17.33.149	10.17.33.149
204	10.17.33.150/31	10.17.33.150 – 10.17.33.151	10.17.33.151
205	10.17.33.152/31	10.17.33.152 – 10.17.33.153	10.17.33.153
206	10.17.33.154/31	10.17.33.154 – 10.17.33.155	10.17.33.155
207	10.17.33.156/31	10.17.33.156 – 10.17.33.157	10.17.33.157
208	10.17.33.158/31	10.17.33.158 – 10.17.33.159	10.17.33.159
209	10.17.33.160/31	10.17.33.160 – 10.17.33.161	10.17.33.161
210	10.17.33.162/31	10.17.33.162 – 10.17.33.163	10.17.33.163
211	10.17.33.164/31	10.17.33.164 – 10.17.33.165	10.17.33.165
212	10.17.33.166/31	10.17.33.166 – 10.17.33.167	10.17.33.167
213	10.17.33.168/31	10.17.33.168 – 10.17.33.169	10.17.33.169
214	10.17.33.170/31	10.17.33.170 – 10.17.33.171	10.17.33.171
215	10.17.33.172/31	10.17.33.172 – 10.17.33.173	10.17.33.173
216	10.17.33.174/31	10.17.33.174 – 10.17.33.175	10.17.33.175
217	10.17.33.176/31	10.17.33.176 – 10.17.33.177	10.17.33.177
218	10.17.33.178/31	10.17.33.178 – 10.17.33.179	10.17.33.179
219	10.17.33.180/31	10.17.33.180 – 10.17.33.181	10.17.33.181
220	10.17.33.182/31	10.17.33.182 – 10.17.33.183	10.17.33.183
221	10.17.33.184/31	10.17.33.184 – 10.17.33.185	10.17.33.185
222	10.17.33.186/31	10.17.33.186 – 10.17.33.187	10.17.33.187
223	10.17.33.188/31	10.17.33.188 – 10.17.33.189	10.17.33.189
224	10.17.33.190/31	10.17.33.190 – 10.17.33.191	10.17.33.191
225	10.17.33.192/31	10.17.33.192 – 10.17.33.193	10.17.33.193
226	10.17.33.194/31	10.17.33.194 – 10.17.33.195	10.17.33.195
227	10.17.33.196/31	10.17.33.196 – 10.17.33.197	10.17.33.197
228	10.17.33.198/31	10.17.33.198 – 10.17.33.199	10.17.33.199
229	10.17.33.200/31	10.17.33.200 – 10.17.33.201	10.17.33.201
230	10.17.33.202/31	10.17.33.202 – 10.17.33.203	10.17.33.203
231	10.17.33.204/31	10.17.33.204 – 10.17.33.205	10.17.33.205
232	10.17.33.206/31	10.17.33.206 – 10.17.33.207	10.17.33.207
233	10.17.33.208/31	10.17.33.208 – 10.17.33.209	10.17.33.209
234	10.17.33.210/31	10.17.33.210 – 10.17.33.211	10.17.33.211
235	10.17.33.212/31	10.17.33.212 – 10.17.33.213	10.17.33.213
236	10.17.33.214/31	10.17.33.214 – 10.17.33.215	10.17.33.215
237	10.17.33.216/31	10.17.33.216 – 10.17.33.217	10.17.33.217
238	10.17.33.218/31	10.17.33.218 – 10.17.33.219	10.17.33.219
239	10.17.33.220/31	10.17.33.220 – 10.17.33.221	10.17.33.221
240	10.17.33.222/31	10.17.33.222 – 10.17.33.223	10.17.33.223
241	10.17.33.224/31	10.17.33.224 – 10.17.33.225	10.17.33.225
242	10.17.33.226/31	10.17.33.226 – 10.17.33.227	10.17.33.227
243	10.17.33.228/31	10.17.33.228 – 10.17.33.229	10.17.33.229
244	10.17.33.230/31	10.17.33.230 – 10.17.33.231	10.17.33.231
245	10.17.33.232/31	10.17.33.232 – 10.17.33.233	10.17.33.233
246	10.17.33.234/31	10.17.33.234 – 10.17.33.235	10.17.33.235
247	10.17.33.236/31	10.17.33.236 – 10.17.33.237	10.17.33.237
248	10.17.33.238/31	10.17.33.238 – 10.17.33.239	10.17.33.239
249	10.17.33.240/31	10.17.33.240 – 10.17.33.241	10.17.33.241
250	10.17.33.242/31	10.17.33.242 – 10.17.33.243	10.17.33.243
251	10.17.33.244/31	10.17.33.244 – 10.17.33.245	10.17.33.245
252	10.17.33.246/31	10.17.33.246 – 10.17.33.247	10.17.33.247
253	10.17.33.248/31	10.17.33.248 – 10.17.33.249	10.17.33.249
254	10.17.33.250/31	10.17.33.250 – 10.17.33.251	10.17.33.251
255	10.17.33.252/31	10.17.33.252 – 10.17.33.253	10.17.33.253
256	10.17.33.254/31	10.17.33.254 – 10.17.33.255	10.17.33.255

showing 256 of 4,096

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 /19
/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	1
/20	255.255.240.0	4,096	4,094	2 split →
/21	255.255.248.0	2,048	2,046	4 split →
/22	255.255.252.0	1,024	1,022	8 split →
/23	255.255.254.0	512	510	16 split →
/24	255.255.255.0	256	254	32 split →
/25	255.255.255.128	128	126	64 split →
/26	255.255.255.192	64	62	128 split →
/27	255.255.255.224	32	30	256 split →
/28	255.255.255.240	16	14	512 split →
/29	255.255.255.248	8	6	1,024 split →
/30	255.255.255.252	4	2	2,048 split →
/31	255.255.255.254	2	2	4,096 split →
/32	255.255.255.255	1	1	8,192 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 →