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)10.0.112.0/20

network10.0.112.0/20

broadcast10.0.127.255

first host10.0.112.1

last host10.0.127.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.0.112.0/20

address00001010.00000000.01110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000000.01110000.00000000

broadcast00001010.00000000.01111111.11111111

green = network part, grey = host part

hex0x0a007000

decimal167800832

reverse dns0.112.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:7000

/20 split into /31 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.0.112.0/31	10.0.112.0 – 10.0.112.1	10.0.112.1
2	10.0.112.2/31	10.0.112.2 – 10.0.112.3	10.0.112.3
3	10.0.112.4/31	10.0.112.4 – 10.0.112.5	10.0.112.5
4	10.0.112.6/31	10.0.112.6 – 10.0.112.7	10.0.112.7
5	10.0.112.8/31	10.0.112.8 – 10.0.112.9	10.0.112.9
6	10.0.112.10/31	10.0.112.10 – 10.0.112.11	10.0.112.11
7	10.0.112.12/31	10.0.112.12 – 10.0.112.13	10.0.112.13
8	10.0.112.14/31	10.0.112.14 – 10.0.112.15	10.0.112.15
9	10.0.112.16/31	10.0.112.16 – 10.0.112.17	10.0.112.17
10	10.0.112.18/31	10.0.112.18 – 10.0.112.19	10.0.112.19
11	10.0.112.20/31	10.0.112.20 – 10.0.112.21	10.0.112.21
12	10.0.112.22/31	10.0.112.22 – 10.0.112.23	10.0.112.23
13	10.0.112.24/31	10.0.112.24 – 10.0.112.25	10.0.112.25
14	10.0.112.26/31	10.0.112.26 – 10.0.112.27	10.0.112.27
15	10.0.112.28/31	10.0.112.28 – 10.0.112.29	10.0.112.29
16	10.0.112.30/31	10.0.112.30 – 10.0.112.31	10.0.112.31
17	10.0.112.32/31	10.0.112.32 – 10.0.112.33	10.0.112.33
18	10.0.112.34/31	10.0.112.34 – 10.0.112.35	10.0.112.35
19	10.0.112.36/31	10.0.112.36 – 10.0.112.37	10.0.112.37
20	10.0.112.38/31	10.0.112.38 – 10.0.112.39	10.0.112.39
21	10.0.112.40/31	10.0.112.40 – 10.0.112.41	10.0.112.41
22	10.0.112.42/31	10.0.112.42 – 10.0.112.43	10.0.112.43
23	10.0.112.44/31	10.0.112.44 – 10.0.112.45	10.0.112.45
24	10.0.112.46/31	10.0.112.46 – 10.0.112.47	10.0.112.47
25	10.0.112.48/31	10.0.112.48 – 10.0.112.49	10.0.112.49
26	10.0.112.50/31	10.0.112.50 – 10.0.112.51	10.0.112.51
27	10.0.112.52/31	10.0.112.52 – 10.0.112.53	10.0.112.53
28	10.0.112.54/31	10.0.112.54 – 10.0.112.55	10.0.112.55
29	10.0.112.56/31	10.0.112.56 – 10.0.112.57	10.0.112.57
30	10.0.112.58/31	10.0.112.58 – 10.0.112.59	10.0.112.59
31	10.0.112.60/31	10.0.112.60 – 10.0.112.61	10.0.112.61
32	10.0.112.62/31	10.0.112.62 – 10.0.112.63	10.0.112.63
33	10.0.112.64/31	10.0.112.64 – 10.0.112.65	10.0.112.65
34	10.0.112.66/31	10.0.112.66 – 10.0.112.67	10.0.112.67
35	10.0.112.68/31	10.0.112.68 – 10.0.112.69	10.0.112.69
36	10.0.112.70/31	10.0.112.70 – 10.0.112.71	10.0.112.71
37	10.0.112.72/31	10.0.112.72 – 10.0.112.73	10.0.112.73
38	10.0.112.74/31	10.0.112.74 – 10.0.112.75	10.0.112.75
39	10.0.112.76/31	10.0.112.76 – 10.0.112.77	10.0.112.77
40	10.0.112.78/31	10.0.112.78 – 10.0.112.79	10.0.112.79
41	10.0.112.80/31	10.0.112.80 – 10.0.112.81	10.0.112.81
42	10.0.112.82/31	10.0.112.82 – 10.0.112.83	10.0.112.83
43	10.0.112.84/31	10.0.112.84 – 10.0.112.85	10.0.112.85
44	10.0.112.86/31	10.0.112.86 – 10.0.112.87	10.0.112.87
45	10.0.112.88/31	10.0.112.88 – 10.0.112.89	10.0.112.89
46	10.0.112.90/31	10.0.112.90 – 10.0.112.91	10.0.112.91
47	10.0.112.92/31	10.0.112.92 – 10.0.112.93	10.0.112.93
48	10.0.112.94/31	10.0.112.94 – 10.0.112.95	10.0.112.95
49	10.0.112.96/31	10.0.112.96 – 10.0.112.97	10.0.112.97
50	10.0.112.98/31	10.0.112.98 – 10.0.112.99	10.0.112.99
51	10.0.112.100/31	10.0.112.100 – 10.0.112.101	10.0.112.101
52	10.0.112.102/31	10.0.112.102 – 10.0.112.103	10.0.112.103
53	10.0.112.104/31	10.0.112.104 – 10.0.112.105	10.0.112.105
54	10.0.112.106/31	10.0.112.106 – 10.0.112.107	10.0.112.107
55	10.0.112.108/31	10.0.112.108 – 10.0.112.109	10.0.112.109
56	10.0.112.110/31	10.0.112.110 – 10.0.112.111	10.0.112.111
57	10.0.112.112/31	10.0.112.112 – 10.0.112.113	10.0.112.113
58	10.0.112.114/31	10.0.112.114 – 10.0.112.115	10.0.112.115
59	10.0.112.116/31	10.0.112.116 – 10.0.112.117	10.0.112.117
60	10.0.112.118/31	10.0.112.118 – 10.0.112.119	10.0.112.119
61	10.0.112.120/31	10.0.112.120 – 10.0.112.121	10.0.112.121
62	10.0.112.122/31	10.0.112.122 – 10.0.112.123	10.0.112.123
63	10.0.112.124/31	10.0.112.124 – 10.0.112.125	10.0.112.125
64	10.0.112.126/31	10.0.112.126 – 10.0.112.127	10.0.112.127
65	10.0.112.128/31	10.0.112.128 – 10.0.112.129	10.0.112.129
66	10.0.112.130/31	10.0.112.130 – 10.0.112.131	10.0.112.131
67	10.0.112.132/31	10.0.112.132 – 10.0.112.133	10.0.112.133
68	10.0.112.134/31	10.0.112.134 – 10.0.112.135	10.0.112.135
69	10.0.112.136/31	10.0.112.136 – 10.0.112.137	10.0.112.137
70	10.0.112.138/31	10.0.112.138 – 10.0.112.139	10.0.112.139
71	10.0.112.140/31	10.0.112.140 – 10.0.112.141	10.0.112.141
72	10.0.112.142/31	10.0.112.142 – 10.0.112.143	10.0.112.143
73	10.0.112.144/31	10.0.112.144 – 10.0.112.145	10.0.112.145
74	10.0.112.146/31	10.0.112.146 – 10.0.112.147	10.0.112.147
75	10.0.112.148/31	10.0.112.148 – 10.0.112.149	10.0.112.149
76	10.0.112.150/31	10.0.112.150 – 10.0.112.151	10.0.112.151
77	10.0.112.152/31	10.0.112.152 – 10.0.112.153	10.0.112.153
78	10.0.112.154/31	10.0.112.154 – 10.0.112.155	10.0.112.155
79	10.0.112.156/31	10.0.112.156 – 10.0.112.157	10.0.112.157
80	10.0.112.158/31	10.0.112.158 – 10.0.112.159	10.0.112.159
81	10.0.112.160/31	10.0.112.160 – 10.0.112.161	10.0.112.161
82	10.0.112.162/31	10.0.112.162 – 10.0.112.163	10.0.112.163
83	10.0.112.164/31	10.0.112.164 – 10.0.112.165	10.0.112.165
84	10.0.112.166/31	10.0.112.166 – 10.0.112.167	10.0.112.167
85	10.0.112.168/31	10.0.112.168 – 10.0.112.169	10.0.112.169
86	10.0.112.170/31	10.0.112.170 – 10.0.112.171	10.0.112.171
87	10.0.112.172/31	10.0.112.172 – 10.0.112.173	10.0.112.173
88	10.0.112.174/31	10.0.112.174 – 10.0.112.175	10.0.112.175
89	10.0.112.176/31	10.0.112.176 – 10.0.112.177	10.0.112.177
90	10.0.112.178/31	10.0.112.178 – 10.0.112.179	10.0.112.179
91	10.0.112.180/31	10.0.112.180 – 10.0.112.181	10.0.112.181
92	10.0.112.182/31	10.0.112.182 – 10.0.112.183	10.0.112.183
93	10.0.112.184/31	10.0.112.184 – 10.0.112.185	10.0.112.185
94	10.0.112.186/31	10.0.112.186 – 10.0.112.187	10.0.112.187
95	10.0.112.188/31	10.0.112.188 – 10.0.112.189	10.0.112.189
96	10.0.112.190/31	10.0.112.190 – 10.0.112.191	10.0.112.191
97	10.0.112.192/31	10.0.112.192 – 10.0.112.193	10.0.112.193
98	10.0.112.194/31	10.0.112.194 – 10.0.112.195	10.0.112.195
99	10.0.112.196/31	10.0.112.196 – 10.0.112.197	10.0.112.197
100	10.0.112.198/31	10.0.112.198 – 10.0.112.199	10.0.112.199
101	10.0.112.200/31	10.0.112.200 – 10.0.112.201	10.0.112.201
102	10.0.112.202/31	10.0.112.202 – 10.0.112.203	10.0.112.203
103	10.0.112.204/31	10.0.112.204 – 10.0.112.205	10.0.112.205
104	10.0.112.206/31	10.0.112.206 – 10.0.112.207	10.0.112.207
105	10.0.112.208/31	10.0.112.208 – 10.0.112.209	10.0.112.209
106	10.0.112.210/31	10.0.112.210 – 10.0.112.211	10.0.112.211
107	10.0.112.212/31	10.0.112.212 – 10.0.112.213	10.0.112.213
108	10.0.112.214/31	10.0.112.214 – 10.0.112.215	10.0.112.215
109	10.0.112.216/31	10.0.112.216 – 10.0.112.217	10.0.112.217
110	10.0.112.218/31	10.0.112.218 – 10.0.112.219	10.0.112.219
111	10.0.112.220/31	10.0.112.220 – 10.0.112.221	10.0.112.221
112	10.0.112.222/31	10.0.112.222 – 10.0.112.223	10.0.112.223
113	10.0.112.224/31	10.0.112.224 – 10.0.112.225	10.0.112.225
114	10.0.112.226/31	10.0.112.226 – 10.0.112.227	10.0.112.227
115	10.0.112.228/31	10.0.112.228 – 10.0.112.229	10.0.112.229
116	10.0.112.230/31	10.0.112.230 – 10.0.112.231	10.0.112.231
117	10.0.112.232/31	10.0.112.232 – 10.0.112.233	10.0.112.233
118	10.0.112.234/31	10.0.112.234 – 10.0.112.235	10.0.112.235
119	10.0.112.236/31	10.0.112.236 – 10.0.112.237	10.0.112.237
120	10.0.112.238/31	10.0.112.238 – 10.0.112.239	10.0.112.239
121	10.0.112.240/31	10.0.112.240 – 10.0.112.241	10.0.112.241
122	10.0.112.242/31	10.0.112.242 – 10.0.112.243	10.0.112.243
123	10.0.112.244/31	10.0.112.244 – 10.0.112.245	10.0.112.245
124	10.0.112.246/31	10.0.112.246 – 10.0.112.247	10.0.112.247
125	10.0.112.248/31	10.0.112.248 – 10.0.112.249	10.0.112.249
126	10.0.112.250/31	10.0.112.250 – 10.0.112.251	10.0.112.251
127	10.0.112.252/31	10.0.112.252 – 10.0.112.253	10.0.112.253
128	10.0.112.254/31	10.0.112.254 – 10.0.112.255	10.0.112.255
129	10.0.113.0/31	10.0.113.0 – 10.0.113.1	10.0.113.1
130	10.0.113.2/31	10.0.113.2 – 10.0.113.3	10.0.113.3
131	10.0.113.4/31	10.0.113.4 – 10.0.113.5	10.0.113.5
132	10.0.113.6/31	10.0.113.6 – 10.0.113.7	10.0.113.7
133	10.0.113.8/31	10.0.113.8 – 10.0.113.9	10.0.113.9
134	10.0.113.10/31	10.0.113.10 – 10.0.113.11	10.0.113.11
135	10.0.113.12/31	10.0.113.12 – 10.0.113.13	10.0.113.13
136	10.0.113.14/31	10.0.113.14 – 10.0.113.15	10.0.113.15
137	10.0.113.16/31	10.0.113.16 – 10.0.113.17	10.0.113.17
138	10.0.113.18/31	10.0.113.18 – 10.0.113.19	10.0.113.19
139	10.0.113.20/31	10.0.113.20 – 10.0.113.21	10.0.113.21
140	10.0.113.22/31	10.0.113.22 – 10.0.113.23	10.0.113.23
141	10.0.113.24/31	10.0.113.24 – 10.0.113.25	10.0.113.25
142	10.0.113.26/31	10.0.113.26 – 10.0.113.27	10.0.113.27
143	10.0.113.28/31	10.0.113.28 – 10.0.113.29	10.0.113.29
144	10.0.113.30/31	10.0.113.30 – 10.0.113.31	10.0.113.31
145	10.0.113.32/31	10.0.113.32 – 10.0.113.33	10.0.113.33
146	10.0.113.34/31	10.0.113.34 – 10.0.113.35	10.0.113.35
147	10.0.113.36/31	10.0.113.36 – 10.0.113.37	10.0.113.37
148	10.0.113.38/31	10.0.113.38 – 10.0.113.39	10.0.113.39
149	10.0.113.40/31	10.0.113.40 – 10.0.113.41	10.0.113.41
150	10.0.113.42/31	10.0.113.42 – 10.0.113.43	10.0.113.43
151	10.0.113.44/31	10.0.113.44 – 10.0.113.45	10.0.113.45
152	10.0.113.46/31	10.0.113.46 – 10.0.113.47	10.0.113.47
153	10.0.113.48/31	10.0.113.48 – 10.0.113.49	10.0.113.49
154	10.0.113.50/31	10.0.113.50 – 10.0.113.51	10.0.113.51
155	10.0.113.52/31	10.0.113.52 – 10.0.113.53	10.0.113.53
156	10.0.113.54/31	10.0.113.54 – 10.0.113.55	10.0.113.55
157	10.0.113.56/31	10.0.113.56 – 10.0.113.57	10.0.113.57
158	10.0.113.58/31	10.0.113.58 – 10.0.113.59	10.0.113.59
159	10.0.113.60/31	10.0.113.60 – 10.0.113.61	10.0.113.61
160	10.0.113.62/31	10.0.113.62 – 10.0.113.63	10.0.113.63
161	10.0.113.64/31	10.0.113.64 – 10.0.113.65	10.0.113.65
162	10.0.113.66/31	10.0.113.66 – 10.0.113.67	10.0.113.67
163	10.0.113.68/31	10.0.113.68 – 10.0.113.69	10.0.113.69
164	10.0.113.70/31	10.0.113.70 – 10.0.113.71	10.0.113.71
165	10.0.113.72/31	10.0.113.72 – 10.0.113.73	10.0.113.73
166	10.0.113.74/31	10.0.113.74 – 10.0.113.75	10.0.113.75
167	10.0.113.76/31	10.0.113.76 – 10.0.113.77	10.0.113.77
168	10.0.113.78/31	10.0.113.78 – 10.0.113.79	10.0.113.79
169	10.0.113.80/31	10.0.113.80 – 10.0.113.81	10.0.113.81
170	10.0.113.82/31	10.0.113.82 – 10.0.113.83	10.0.113.83
171	10.0.113.84/31	10.0.113.84 – 10.0.113.85	10.0.113.85
172	10.0.113.86/31	10.0.113.86 – 10.0.113.87	10.0.113.87
173	10.0.113.88/31	10.0.113.88 – 10.0.113.89	10.0.113.89
174	10.0.113.90/31	10.0.113.90 – 10.0.113.91	10.0.113.91
175	10.0.113.92/31	10.0.113.92 – 10.0.113.93	10.0.113.93
176	10.0.113.94/31	10.0.113.94 – 10.0.113.95	10.0.113.95
177	10.0.113.96/31	10.0.113.96 – 10.0.113.97	10.0.113.97
178	10.0.113.98/31	10.0.113.98 – 10.0.113.99	10.0.113.99
179	10.0.113.100/31	10.0.113.100 – 10.0.113.101	10.0.113.101
180	10.0.113.102/31	10.0.113.102 – 10.0.113.103	10.0.113.103
181	10.0.113.104/31	10.0.113.104 – 10.0.113.105	10.0.113.105
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189	10.0.113.120/31	10.0.113.120 – 10.0.113.121	10.0.113.121
190	10.0.113.122/31	10.0.113.122 – 10.0.113.123	10.0.113.123
191	10.0.113.124/31	10.0.113.124 – 10.0.113.125	10.0.113.125
192	10.0.113.126/31	10.0.113.126 – 10.0.113.127	10.0.113.127
193	10.0.113.128/31	10.0.113.128 – 10.0.113.129	10.0.113.129
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196	10.0.113.134/31	10.0.113.134 – 10.0.113.135	10.0.113.135
197	10.0.113.136/31	10.0.113.136 – 10.0.113.137	10.0.113.137
198	10.0.113.138/31	10.0.113.138 – 10.0.113.139	10.0.113.139
199	10.0.113.140/31	10.0.113.140 – 10.0.113.141	10.0.113.141
200	10.0.113.142/31	10.0.113.142 – 10.0.113.143	10.0.113.143
201	10.0.113.144/31	10.0.113.144 – 10.0.113.145	10.0.113.145
202	10.0.113.146/31	10.0.113.146 – 10.0.113.147	10.0.113.147
203	10.0.113.148/31	10.0.113.148 – 10.0.113.149	10.0.113.149
204	10.0.113.150/31	10.0.113.150 – 10.0.113.151	10.0.113.151
205	10.0.113.152/31	10.0.113.152 – 10.0.113.153	10.0.113.153
206	10.0.113.154/31	10.0.113.154 – 10.0.113.155	10.0.113.155
207	10.0.113.156/31	10.0.113.156 – 10.0.113.157	10.0.113.157
208	10.0.113.158/31	10.0.113.158 – 10.0.113.159	10.0.113.159
209	10.0.113.160/31	10.0.113.160 – 10.0.113.161	10.0.113.161
210	10.0.113.162/31	10.0.113.162 – 10.0.113.163	10.0.113.163
211	10.0.113.164/31	10.0.113.164 – 10.0.113.165	10.0.113.165
212	10.0.113.166/31	10.0.113.166 – 10.0.113.167	10.0.113.167
213	10.0.113.168/31	10.0.113.168 – 10.0.113.169	10.0.113.169
214	10.0.113.170/31	10.0.113.170 – 10.0.113.171	10.0.113.171
215	10.0.113.172/31	10.0.113.172 – 10.0.113.173	10.0.113.173
216	10.0.113.174/31	10.0.113.174 – 10.0.113.175	10.0.113.175
217	10.0.113.176/31	10.0.113.176 – 10.0.113.177	10.0.113.177
218	10.0.113.178/31	10.0.113.178 – 10.0.113.179	10.0.113.179
219	10.0.113.180/31	10.0.113.180 – 10.0.113.181	10.0.113.181
220	10.0.113.182/31	10.0.113.182 – 10.0.113.183	10.0.113.183
221	10.0.113.184/31	10.0.113.184 – 10.0.113.185	10.0.113.185
222	10.0.113.186/31	10.0.113.186 – 10.0.113.187	10.0.113.187
223	10.0.113.188/31	10.0.113.188 – 10.0.113.189	10.0.113.189
224	10.0.113.190/31	10.0.113.190 – 10.0.113.191	10.0.113.191
225	10.0.113.192/31	10.0.113.192 – 10.0.113.193	10.0.113.193
226	10.0.113.194/31	10.0.113.194 – 10.0.113.195	10.0.113.195
227	10.0.113.196/31	10.0.113.196 – 10.0.113.197	10.0.113.197
228	10.0.113.198/31	10.0.113.198 – 10.0.113.199	10.0.113.199
229	10.0.113.200/31	10.0.113.200 – 10.0.113.201	10.0.113.201
230	10.0.113.202/31	10.0.113.202 – 10.0.113.203	10.0.113.203
231	10.0.113.204/31	10.0.113.204 – 10.0.113.205	10.0.113.205
232	10.0.113.206/31	10.0.113.206 – 10.0.113.207	10.0.113.207
233	10.0.113.208/31	10.0.113.208 – 10.0.113.209	10.0.113.209
234	10.0.113.210/31	10.0.113.210 – 10.0.113.211	10.0.113.211
235	10.0.113.212/31	10.0.113.212 – 10.0.113.213	10.0.113.213
236	10.0.113.214/31	10.0.113.214 – 10.0.113.215	10.0.113.215
237	10.0.113.216/31	10.0.113.216 – 10.0.113.217	10.0.113.217
238	10.0.113.218/31	10.0.113.218 – 10.0.113.219	10.0.113.219
239	10.0.113.220/31	10.0.113.220 – 10.0.113.221	10.0.113.221
240	10.0.113.222/31	10.0.113.222 – 10.0.113.223	10.0.113.223
241	10.0.113.224/31	10.0.113.224 – 10.0.113.225	10.0.113.225
242	10.0.113.226/31	10.0.113.226 – 10.0.113.227	10.0.113.227
243	10.0.113.228/31	10.0.113.228 – 10.0.113.229	10.0.113.229
244	10.0.113.230/31	10.0.113.230 – 10.0.113.231	10.0.113.231
245	10.0.113.232/31	10.0.113.232 – 10.0.113.233	10.0.113.233
246	10.0.113.234/31	10.0.113.234 – 10.0.113.235	10.0.113.235
247	10.0.113.236/31	10.0.113.236 – 10.0.113.237	10.0.113.237
248	10.0.113.238/31	10.0.113.238 – 10.0.113.239	10.0.113.239
249	10.0.113.240/31	10.0.113.240 – 10.0.113.241	10.0.113.241
250	10.0.113.242/31	10.0.113.242 – 10.0.113.243	10.0.113.243
251	10.0.113.244/31	10.0.113.244 – 10.0.113.245	10.0.113.245
252	10.0.113.246/31	10.0.113.246 – 10.0.113.247	10.0.113.247
253	10.0.113.248/31	10.0.113.248 – 10.0.113.249	10.0.113.249
254	10.0.113.250/31	10.0.113.250 – 10.0.113.251	10.0.113.251
255	10.0.113.252/31	10.0.113.252 – 10.0.113.253	10.0.113.253
256	10.0.113.254/31	10.0.113.254 – 10.0.113.255	10.0.113.255

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 →