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)10.7.104.0/21

network10.7.104.0/21

broadcast10.7.111.255

first host10.7.104.1

last host10.7.111.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.7.104.0/21

address00001010.00000111.01101000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000111.01101000.00000000

broadcast00001010.00000111.01101111.11111111

green = network part, grey = host part

hex0x0a076800

decimal168257536

reverse dns0.104.7.10.in-addr.arpa

ipv4-mapped::ffff:a07:6800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.7.104.0/31	10.7.104.0 – 10.7.104.1	10.7.104.1
2	10.7.104.2/31	10.7.104.2 – 10.7.104.3	10.7.104.3
3	10.7.104.4/31	10.7.104.4 – 10.7.104.5	10.7.104.5
4	10.7.104.6/31	10.7.104.6 – 10.7.104.7	10.7.104.7
5	10.7.104.8/31	10.7.104.8 – 10.7.104.9	10.7.104.9
6	10.7.104.10/31	10.7.104.10 – 10.7.104.11	10.7.104.11
7	10.7.104.12/31	10.7.104.12 – 10.7.104.13	10.7.104.13
8	10.7.104.14/31	10.7.104.14 – 10.7.104.15	10.7.104.15
9	10.7.104.16/31	10.7.104.16 – 10.7.104.17	10.7.104.17
10	10.7.104.18/31	10.7.104.18 – 10.7.104.19	10.7.104.19
11	10.7.104.20/31	10.7.104.20 – 10.7.104.21	10.7.104.21
12	10.7.104.22/31	10.7.104.22 – 10.7.104.23	10.7.104.23
13	10.7.104.24/31	10.7.104.24 – 10.7.104.25	10.7.104.25
14	10.7.104.26/31	10.7.104.26 – 10.7.104.27	10.7.104.27
15	10.7.104.28/31	10.7.104.28 – 10.7.104.29	10.7.104.29
16	10.7.104.30/31	10.7.104.30 – 10.7.104.31	10.7.104.31
17	10.7.104.32/31	10.7.104.32 – 10.7.104.33	10.7.104.33
18	10.7.104.34/31	10.7.104.34 – 10.7.104.35	10.7.104.35
19	10.7.104.36/31	10.7.104.36 – 10.7.104.37	10.7.104.37
20	10.7.104.38/31	10.7.104.38 – 10.7.104.39	10.7.104.39
21	10.7.104.40/31	10.7.104.40 – 10.7.104.41	10.7.104.41
22	10.7.104.42/31	10.7.104.42 – 10.7.104.43	10.7.104.43
23	10.7.104.44/31	10.7.104.44 – 10.7.104.45	10.7.104.45
24	10.7.104.46/31	10.7.104.46 – 10.7.104.47	10.7.104.47
25	10.7.104.48/31	10.7.104.48 – 10.7.104.49	10.7.104.49
26	10.7.104.50/31	10.7.104.50 – 10.7.104.51	10.7.104.51
27	10.7.104.52/31	10.7.104.52 – 10.7.104.53	10.7.104.53
28	10.7.104.54/31	10.7.104.54 – 10.7.104.55	10.7.104.55
29	10.7.104.56/31	10.7.104.56 – 10.7.104.57	10.7.104.57
30	10.7.104.58/31	10.7.104.58 – 10.7.104.59	10.7.104.59
31	10.7.104.60/31	10.7.104.60 – 10.7.104.61	10.7.104.61
32	10.7.104.62/31	10.7.104.62 – 10.7.104.63	10.7.104.63
33	10.7.104.64/31	10.7.104.64 – 10.7.104.65	10.7.104.65
34	10.7.104.66/31	10.7.104.66 – 10.7.104.67	10.7.104.67
35	10.7.104.68/31	10.7.104.68 – 10.7.104.69	10.7.104.69
36	10.7.104.70/31	10.7.104.70 – 10.7.104.71	10.7.104.71
37	10.7.104.72/31	10.7.104.72 – 10.7.104.73	10.7.104.73
38	10.7.104.74/31	10.7.104.74 – 10.7.104.75	10.7.104.75
39	10.7.104.76/31	10.7.104.76 – 10.7.104.77	10.7.104.77
40	10.7.104.78/31	10.7.104.78 – 10.7.104.79	10.7.104.79
41	10.7.104.80/31	10.7.104.80 – 10.7.104.81	10.7.104.81
42	10.7.104.82/31	10.7.104.82 – 10.7.104.83	10.7.104.83
43	10.7.104.84/31	10.7.104.84 – 10.7.104.85	10.7.104.85
44	10.7.104.86/31	10.7.104.86 – 10.7.104.87	10.7.104.87
45	10.7.104.88/31	10.7.104.88 – 10.7.104.89	10.7.104.89
46	10.7.104.90/31	10.7.104.90 – 10.7.104.91	10.7.104.91
47	10.7.104.92/31	10.7.104.92 – 10.7.104.93	10.7.104.93
48	10.7.104.94/31	10.7.104.94 – 10.7.104.95	10.7.104.95
49	10.7.104.96/31	10.7.104.96 – 10.7.104.97	10.7.104.97
50	10.7.104.98/31	10.7.104.98 – 10.7.104.99	10.7.104.99
51	10.7.104.100/31	10.7.104.100 – 10.7.104.101	10.7.104.101
52	10.7.104.102/31	10.7.104.102 – 10.7.104.103	10.7.104.103
53	10.7.104.104/31	10.7.104.104 – 10.7.104.105	10.7.104.105
54	10.7.104.106/31	10.7.104.106 – 10.7.104.107	10.7.104.107
55	10.7.104.108/31	10.7.104.108 – 10.7.104.109	10.7.104.109
56	10.7.104.110/31	10.7.104.110 – 10.7.104.111	10.7.104.111
57	10.7.104.112/31	10.7.104.112 – 10.7.104.113	10.7.104.113
58	10.7.104.114/31	10.7.104.114 – 10.7.104.115	10.7.104.115
59	10.7.104.116/31	10.7.104.116 – 10.7.104.117	10.7.104.117
60	10.7.104.118/31	10.7.104.118 – 10.7.104.119	10.7.104.119
61	10.7.104.120/31	10.7.104.120 – 10.7.104.121	10.7.104.121
62	10.7.104.122/31	10.7.104.122 – 10.7.104.123	10.7.104.123
63	10.7.104.124/31	10.7.104.124 – 10.7.104.125	10.7.104.125
64	10.7.104.126/31	10.7.104.126 – 10.7.104.127	10.7.104.127
65	10.7.104.128/31	10.7.104.128 – 10.7.104.129	10.7.104.129
66	10.7.104.130/31	10.7.104.130 – 10.7.104.131	10.7.104.131
67	10.7.104.132/31	10.7.104.132 – 10.7.104.133	10.7.104.133
68	10.7.104.134/31	10.7.104.134 – 10.7.104.135	10.7.104.135
69	10.7.104.136/31	10.7.104.136 – 10.7.104.137	10.7.104.137
70	10.7.104.138/31	10.7.104.138 – 10.7.104.139	10.7.104.139
71	10.7.104.140/31	10.7.104.140 – 10.7.104.141	10.7.104.141
72	10.7.104.142/31	10.7.104.142 – 10.7.104.143	10.7.104.143
73	10.7.104.144/31	10.7.104.144 – 10.7.104.145	10.7.104.145
74	10.7.104.146/31	10.7.104.146 – 10.7.104.147	10.7.104.147
75	10.7.104.148/31	10.7.104.148 – 10.7.104.149	10.7.104.149
76	10.7.104.150/31	10.7.104.150 – 10.7.104.151	10.7.104.151
77	10.7.104.152/31	10.7.104.152 – 10.7.104.153	10.7.104.153
78	10.7.104.154/31	10.7.104.154 – 10.7.104.155	10.7.104.155
79	10.7.104.156/31	10.7.104.156 – 10.7.104.157	10.7.104.157
80	10.7.104.158/31	10.7.104.158 – 10.7.104.159	10.7.104.159
81	10.7.104.160/31	10.7.104.160 – 10.7.104.161	10.7.104.161
82	10.7.104.162/31	10.7.104.162 – 10.7.104.163	10.7.104.163
83	10.7.104.164/31	10.7.104.164 – 10.7.104.165	10.7.104.165
84	10.7.104.166/31	10.7.104.166 – 10.7.104.167	10.7.104.167
85	10.7.104.168/31	10.7.104.168 – 10.7.104.169	10.7.104.169
86	10.7.104.170/31	10.7.104.170 – 10.7.104.171	10.7.104.171
87	10.7.104.172/31	10.7.104.172 – 10.7.104.173	10.7.104.173
88	10.7.104.174/31	10.7.104.174 – 10.7.104.175	10.7.104.175
89	10.7.104.176/31	10.7.104.176 – 10.7.104.177	10.7.104.177
90	10.7.104.178/31	10.7.104.178 – 10.7.104.179	10.7.104.179
91	10.7.104.180/31	10.7.104.180 – 10.7.104.181	10.7.104.181
92	10.7.104.182/31	10.7.104.182 – 10.7.104.183	10.7.104.183
93	10.7.104.184/31	10.7.104.184 – 10.7.104.185	10.7.104.185
94	10.7.104.186/31	10.7.104.186 – 10.7.104.187	10.7.104.187
95	10.7.104.188/31	10.7.104.188 – 10.7.104.189	10.7.104.189
96	10.7.104.190/31	10.7.104.190 – 10.7.104.191	10.7.104.191
97	10.7.104.192/31	10.7.104.192 – 10.7.104.193	10.7.104.193
98	10.7.104.194/31	10.7.104.194 – 10.7.104.195	10.7.104.195
99	10.7.104.196/31	10.7.104.196 – 10.7.104.197	10.7.104.197
100	10.7.104.198/31	10.7.104.198 – 10.7.104.199	10.7.104.199
101	10.7.104.200/31	10.7.104.200 – 10.7.104.201	10.7.104.201
102	10.7.104.202/31	10.7.104.202 – 10.7.104.203	10.7.104.203
103	10.7.104.204/31	10.7.104.204 – 10.7.104.205	10.7.104.205
104	10.7.104.206/31	10.7.104.206 – 10.7.104.207	10.7.104.207
105	10.7.104.208/31	10.7.104.208 – 10.7.104.209	10.7.104.209
106	10.7.104.210/31	10.7.104.210 – 10.7.104.211	10.7.104.211
107	10.7.104.212/31	10.7.104.212 – 10.7.104.213	10.7.104.213
108	10.7.104.214/31	10.7.104.214 – 10.7.104.215	10.7.104.215
109	10.7.104.216/31	10.7.104.216 – 10.7.104.217	10.7.104.217
110	10.7.104.218/31	10.7.104.218 – 10.7.104.219	10.7.104.219
111	10.7.104.220/31	10.7.104.220 – 10.7.104.221	10.7.104.221
112	10.7.104.222/31	10.7.104.222 – 10.7.104.223	10.7.104.223
113	10.7.104.224/31	10.7.104.224 – 10.7.104.225	10.7.104.225
114	10.7.104.226/31	10.7.104.226 – 10.7.104.227	10.7.104.227
115	10.7.104.228/31	10.7.104.228 – 10.7.104.229	10.7.104.229
116	10.7.104.230/31	10.7.104.230 – 10.7.104.231	10.7.104.231
117	10.7.104.232/31	10.7.104.232 – 10.7.104.233	10.7.104.233
118	10.7.104.234/31	10.7.104.234 – 10.7.104.235	10.7.104.235
119	10.7.104.236/31	10.7.104.236 – 10.7.104.237	10.7.104.237
120	10.7.104.238/31	10.7.104.238 – 10.7.104.239	10.7.104.239
121	10.7.104.240/31	10.7.104.240 – 10.7.104.241	10.7.104.241
122	10.7.104.242/31	10.7.104.242 – 10.7.104.243	10.7.104.243
123	10.7.104.244/31	10.7.104.244 – 10.7.104.245	10.7.104.245
124	10.7.104.246/31	10.7.104.246 – 10.7.104.247	10.7.104.247
125	10.7.104.248/31	10.7.104.248 – 10.7.104.249	10.7.104.249
126	10.7.104.250/31	10.7.104.250 – 10.7.104.251	10.7.104.251
127	10.7.104.252/31	10.7.104.252 – 10.7.104.253	10.7.104.253
128	10.7.104.254/31	10.7.104.254 – 10.7.104.255	10.7.104.255
129	10.7.105.0/31	10.7.105.0 – 10.7.105.1	10.7.105.1
130	10.7.105.2/31	10.7.105.2 – 10.7.105.3	10.7.105.3
131	10.7.105.4/31	10.7.105.4 – 10.7.105.5	10.7.105.5
132	10.7.105.6/31	10.7.105.6 – 10.7.105.7	10.7.105.7
133	10.7.105.8/31	10.7.105.8 – 10.7.105.9	10.7.105.9
134	10.7.105.10/31	10.7.105.10 – 10.7.105.11	10.7.105.11
135	10.7.105.12/31	10.7.105.12 – 10.7.105.13	10.7.105.13
136	10.7.105.14/31	10.7.105.14 – 10.7.105.15	10.7.105.15
137	10.7.105.16/31	10.7.105.16 – 10.7.105.17	10.7.105.17
138	10.7.105.18/31	10.7.105.18 – 10.7.105.19	10.7.105.19
139	10.7.105.20/31	10.7.105.20 – 10.7.105.21	10.7.105.21
140	10.7.105.22/31	10.7.105.22 – 10.7.105.23	10.7.105.23
141	10.7.105.24/31	10.7.105.24 – 10.7.105.25	10.7.105.25
142	10.7.105.26/31	10.7.105.26 – 10.7.105.27	10.7.105.27
143	10.7.105.28/31	10.7.105.28 – 10.7.105.29	10.7.105.29
144	10.7.105.30/31	10.7.105.30 – 10.7.105.31	10.7.105.31
145	10.7.105.32/31	10.7.105.32 – 10.7.105.33	10.7.105.33
146	10.7.105.34/31	10.7.105.34 – 10.7.105.35	10.7.105.35
147	10.7.105.36/31	10.7.105.36 – 10.7.105.37	10.7.105.37
148	10.7.105.38/31	10.7.105.38 – 10.7.105.39	10.7.105.39
149	10.7.105.40/31	10.7.105.40 – 10.7.105.41	10.7.105.41
150	10.7.105.42/31	10.7.105.42 – 10.7.105.43	10.7.105.43
151	10.7.105.44/31	10.7.105.44 – 10.7.105.45	10.7.105.45
152	10.7.105.46/31	10.7.105.46 – 10.7.105.47	10.7.105.47
153	10.7.105.48/31	10.7.105.48 – 10.7.105.49	10.7.105.49
154	10.7.105.50/31	10.7.105.50 – 10.7.105.51	10.7.105.51
155	10.7.105.52/31	10.7.105.52 – 10.7.105.53	10.7.105.53
156	10.7.105.54/31	10.7.105.54 – 10.7.105.55	10.7.105.55
157	10.7.105.56/31	10.7.105.56 – 10.7.105.57	10.7.105.57
158	10.7.105.58/31	10.7.105.58 – 10.7.105.59	10.7.105.59
159	10.7.105.60/31	10.7.105.60 – 10.7.105.61	10.7.105.61
160	10.7.105.62/31	10.7.105.62 – 10.7.105.63	10.7.105.63
161	10.7.105.64/31	10.7.105.64 – 10.7.105.65	10.7.105.65
162	10.7.105.66/31	10.7.105.66 – 10.7.105.67	10.7.105.67
163	10.7.105.68/31	10.7.105.68 – 10.7.105.69	10.7.105.69
164	10.7.105.70/31	10.7.105.70 – 10.7.105.71	10.7.105.71
165	10.7.105.72/31	10.7.105.72 – 10.7.105.73	10.7.105.73
166	10.7.105.74/31	10.7.105.74 – 10.7.105.75	10.7.105.75
167	10.7.105.76/31	10.7.105.76 – 10.7.105.77	10.7.105.77
168	10.7.105.78/31	10.7.105.78 – 10.7.105.79	10.7.105.79
169	10.7.105.80/31	10.7.105.80 – 10.7.105.81	10.7.105.81
170	10.7.105.82/31	10.7.105.82 – 10.7.105.83	10.7.105.83
171	10.7.105.84/31	10.7.105.84 – 10.7.105.85	10.7.105.85
172	10.7.105.86/31	10.7.105.86 – 10.7.105.87	10.7.105.87
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175	10.7.105.92/31	10.7.105.92 – 10.7.105.93	10.7.105.93
176	10.7.105.94/31	10.7.105.94 – 10.7.105.95	10.7.105.95
177	10.7.105.96/31	10.7.105.96 – 10.7.105.97	10.7.105.97
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196	10.7.105.134/31	10.7.105.134 – 10.7.105.135	10.7.105.135
197	10.7.105.136/31	10.7.105.136 – 10.7.105.137	10.7.105.137
198	10.7.105.138/31	10.7.105.138 – 10.7.105.139	10.7.105.139
199	10.7.105.140/31	10.7.105.140 – 10.7.105.141	10.7.105.141
200	10.7.105.142/31	10.7.105.142 – 10.7.105.143	10.7.105.143
201	10.7.105.144/31	10.7.105.144 – 10.7.105.145	10.7.105.145
202	10.7.105.146/31	10.7.105.146 – 10.7.105.147	10.7.105.147
203	10.7.105.148/31	10.7.105.148 – 10.7.105.149	10.7.105.149
204	10.7.105.150/31	10.7.105.150 – 10.7.105.151	10.7.105.151
205	10.7.105.152/31	10.7.105.152 – 10.7.105.153	10.7.105.153
206	10.7.105.154/31	10.7.105.154 – 10.7.105.155	10.7.105.155
207	10.7.105.156/31	10.7.105.156 – 10.7.105.157	10.7.105.157
208	10.7.105.158/31	10.7.105.158 – 10.7.105.159	10.7.105.159
209	10.7.105.160/31	10.7.105.160 – 10.7.105.161	10.7.105.161
210	10.7.105.162/31	10.7.105.162 – 10.7.105.163	10.7.105.163
211	10.7.105.164/31	10.7.105.164 – 10.7.105.165	10.7.105.165
212	10.7.105.166/31	10.7.105.166 – 10.7.105.167	10.7.105.167
213	10.7.105.168/31	10.7.105.168 – 10.7.105.169	10.7.105.169
214	10.7.105.170/31	10.7.105.170 – 10.7.105.171	10.7.105.171
215	10.7.105.172/31	10.7.105.172 – 10.7.105.173	10.7.105.173
216	10.7.105.174/31	10.7.105.174 – 10.7.105.175	10.7.105.175
217	10.7.105.176/31	10.7.105.176 – 10.7.105.177	10.7.105.177
218	10.7.105.178/31	10.7.105.178 – 10.7.105.179	10.7.105.179
219	10.7.105.180/31	10.7.105.180 – 10.7.105.181	10.7.105.181
220	10.7.105.182/31	10.7.105.182 – 10.7.105.183	10.7.105.183
221	10.7.105.184/31	10.7.105.184 – 10.7.105.185	10.7.105.185
222	10.7.105.186/31	10.7.105.186 – 10.7.105.187	10.7.105.187
223	10.7.105.188/31	10.7.105.188 – 10.7.105.189	10.7.105.189
224	10.7.105.190/31	10.7.105.190 – 10.7.105.191	10.7.105.191
225	10.7.105.192/31	10.7.105.192 – 10.7.105.193	10.7.105.193
226	10.7.105.194/31	10.7.105.194 – 10.7.105.195	10.7.105.195
227	10.7.105.196/31	10.7.105.196 – 10.7.105.197	10.7.105.197
228	10.7.105.198/31	10.7.105.198 – 10.7.105.199	10.7.105.199
229	10.7.105.200/31	10.7.105.200 – 10.7.105.201	10.7.105.201
230	10.7.105.202/31	10.7.105.202 – 10.7.105.203	10.7.105.203
231	10.7.105.204/31	10.7.105.204 – 10.7.105.205	10.7.105.205
232	10.7.105.206/31	10.7.105.206 – 10.7.105.207	10.7.105.207
233	10.7.105.208/31	10.7.105.208 – 10.7.105.209	10.7.105.209
234	10.7.105.210/31	10.7.105.210 – 10.7.105.211	10.7.105.211
235	10.7.105.212/31	10.7.105.212 – 10.7.105.213	10.7.105.213
236	10.7.105.214/31	10.7.105.214 – 10.7.105.215	10.7.105.215
237	10.7.105.216/31	10.7.105.216 – 10.7.105.217	10.7.105.217
238	10.7.105.218/31	10.7.105.218 – 10.7.105.219	10.7.105.219
239	10.7.105.220/31	10.7.105.220 – 10.7.105.221	10.7.105.221
240	10.7.105.222/31	10.7.105.222 – 10.7.105.223	10.7.105.223
241	10.7.105.224/31	10.7.105.224 – 10.7.105.225	10.7.105.225
242	10.7.105.226/31	10.7.105.226 – 10.7.105.227	10.7.105.227
243	10.7.105.228/31	10.7.105.228 – 10.7.105.229	10.7.105.229
244	10.7.105.230/31	10.7.105.230 – 10.7.105.231	10.7.105.231
245	10.7.105.232/31	10.7.105.232 – 10.7.105.233	10.7.105.233
246	10.7.105.234/31	10.7.105.234 – 10.7.105.235	10.7.105.235
247	10.7.105.236/31	10.7.105.236 – 10.7.105.237	10.7.105.237
248	10.7.105.238/31	10.7.105.238 – 10.7.105.239	10.7.105.239
249	10.7.105.240/31	10.7.105.240 – 10.7.105.241	10.7.105.241
250	10.7.105.242/31	10.7.105.242 – 10.7.105.243	10.7.105.243
251	10.7.105.244/31	10.7.105.244 – 10.7.105.245	10.7.105.245
252	10.7.105.246/31	10.7.105.246 – 10.7.105.247	10.7.105.247
253	10.7.105.248/31	10.7.105.248 – 10.7.105.249	10.7.105.249
254	10.7.105.250/31	10.7.105.250 – 10.7.105.251	10.7.105.251
255	10.7.105.252/31	10.7.105.252 – 10.7.105.253	10.7.105.253
256	10.7.105.254/31	10.7.105.254 – 10.7.105.255	10.7.105.255

showing 256 of 1,024

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