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)10.4.144.0/20

network10.4.144.0/20

broadcast10.4.159.255

first host10.4.144.1

last host10.4.159.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.4.144.0/20

address00001010.00000100.10010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000100.10010000.00000000

broadcast00001010.00000100.10011111.11111111

green = network part, grey = host part

hex0x0a049000

decimal168071168

reverse dns0.144.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:9000

/20 split into /31 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.4.144.0/31	10.4.144.0 – 10.4.144.1	10.4.144.1
2	10.4.144.2/31	10.4.144.2 – 10.4.144.3	10.4.144.3
3	10.4.144.4/31	10.4.144.4 – 10.4.144.5	10.4.144.5
4	10.4.144.6/31	10.4.144.6 – 10.4.144.7	10.4.144.7
5	10.4.144.8/31	10.4.144.8 – 10.4.144.9	10.4.144.9
6	10.4.144.10/31	10.4.144.10 – 10.4.144.11	10.4.144.11
7	10.4.144.12/31	10.4.144.12 – 10.4.144.13	10.4.144.13
8	10.4.144.14/31	10.4.144.14 – 10.4.144.15	10.4.144.15
9	10.4.144.16/31	10.4.144.16 – 10.4.144.17	10.4.144.17
10	10.4.144.18/31	10.4.144.18 – 10.4.144.19	10.4.144.19
11	10.4.144.20/31	10.4.144.20 – 10.4.144.21	10.4.144.21
12	10.4.144.22/31	10.4.144.22 – 10.4.144.23	10.4.144.23
13	10.4.144.24/31	10.4.144.24 – 10.4.144.25	10.4.144.25
14	10.4.144.26/31	10.4.144.26 – 10.4.144.27	10.4.144.27
15	10.4.144.28/31	10.4.144.28 – 10.4.144.29	10.4.144.29
16	10.4.144.30/31	10.4.144.30 – 10.4.144.31	10.4.144.31
17	10.4.144.32/31	10.4.144.32 – 10.4.144.33	10.4.144.33
18	10.4.144.34/31	10.4.144.34 – 10.4.144.35	10.4.144.35
19	10.4.144.36/31	10.4.144.36 – 10.4.144.37	10.4.144.37
20	10.4.144.38/31	10.4.144.38 – 10.4.144.39	10.4.144.39
21	10.4.144.40/31	10.4.144.40 – 10.4.144.41	10.4.144.41
22	10.4.144.42/31	10.4.144.42 – 10.4.144.43	10.4.144.43
23	10.4.144.44/31	10.4.144.44 – 10.4.144.45	10.4.144.45
24	10.4.144.46/31	10.4.144.46 – 10.4.144.47	10.4.144.47
25	10.4.144.48/31	10.4.144.48 – 10.4.144.49	10.4.144.49
26	10.4.144.50/31	10.4.144.50 – 10.4.144.51	10.4.144.51
27	10.4.144.52/31	10.4.144.52 – 10.4.144.53	10.4.144.53
28	10.4.144.54/31	10.4.144.54 – 10.4.144.55	10.4.144.55
29	10.4.144.56/31	10.4.144.56 – 10.4.144.57	10.4.144.57
30	10.4.144.58/31	10.4.144.58 – 10.4.144.59	10.4.144.59
31	10.4.144.60/31	10.4.144.60 – 10.4.144.61	10.4.144.61
32	10.4.144.62/31	10.4.144.62 – 10.4.144.63	10.4.144.63
33	10.4.144.64/31	10.4.144.64 – 10.4.144.65	10.4.144.65
34	10.4.144.66/31	10.4.144.66 – 10.4.144.67	10.4.144.67
35	10.4.144.68/31	10.4.144.68 – 10.4.144.69	10.4.144.69
36	10.4.144.70/31	10.4.144.70 – 10.4.144.71	10.4.144.71
37	10.4.144.72/31	10.4.144.72 – 10.4.144.73	10.4.144.73
38	10.4.144.74/31	10.4.144.74 – 10.4.144.75	10.4.144.75
39	10.4.144.76/31	10.4.144.76 – 10.4.144.77	10.4.144.77
40	10.4.144.78/31	10.4.144.78 – 10.4.144.79	10.4.144.79
41	10.4.144.80/31	10.4.144.80 – 10.4.144.81	10.4.144.81
42	10.4.144.82/31	10.4.144.82 – 10.4.144.83	10.4.144.83
43	10.4.144.84/31	10.4.144.84 – 10.4.144.85	10.4.144.85
44	10.4.144.86/31	10.4.144.86 – 10.4.144.87	10.4.144.87
45	10.4.144.88/31	10.4.144.88 – 10.4.144.89	10.4.144.89
46	10.4.144.90/31	10.4.144.90 – 10.4.144.91	10.4.144.91
47	10.4.144.92/31	10.4.144.92 – 10.4.144.93	10.4.144.93
48	10.4.144.94/31	10.4.144.94 – 10.4.144.95	10.4.144.95
49	10.4.144.96/31	10.4.144.96 – 10.4.144.97	10.4.144.97
50	10.4.144.98/31	10.4.144.98 – 10.4.144.99	10.4.144.99
51	10.4.144.100/31	10.4.144.100 – 10.4.144.101	10.4.144.101
52	10.4.144.102/31	10.4.144.102 – 10.4.144.103	10.4.144.103
53	10.4.144.104/31	10.4.144.104 – 10.4.144.105	10.4.144.105
54	10.4.144.106/31	10.4.144.106 – 10.4.144.107	10.4.144.107
55	10.4.144.108/31	10.4.144.108 – 10.4.144.109	10.4.144.109
56	10.4.144.110/31	10.4.144.110 – 10.4.144.111	10.4.144.111
57	10.4.144.112/31	10.4.144.112 – 10.4.144.113	10.4.144.113
58	10.4.144.114/31	10.4.144.114 – 10.4.144.115	10.4.144.115
59	10.4.144.116/31	10.4.144.116 – 10.4.144.117	10.4.144.117
60	10.4.144.118/31	10.4.144.118 – 10.4.144.119	10.4.144.119
61	10.4.144.120/31	10.4.144.120 – 10.4.144.121	10.4.144.121
62	10.4.144.122/31	10.4.144.122 – 10.4.144.123	10.4.144.123
63	10.4.144.124/31	10.4.144.124 – 10.4.144.125	10.4.144.125
64	10.4.144.126/31	10.4.144.126 – 10.4.144.127	10.4.144.127
65	10.4.144.128/31	10.4.144.128 – 10.4.144.129	10.4.144.129
66	10.4.144.130/31	10.4.144.130 – 10.4.144.131	10.4.144.131
67	10.4.144.132/31	10.4.144.132 – 10.4.144.133	10.4.144.133
68	10.4.144.134/31	10.4.144.134 – 10.4.144.135	10.4.144.135
69	10.4.144.136/31	10.4.144.136 – 10.4.144.137	10.4.144.137
70	10.4.144.138/31	10.4.144.138 – 10.4.144.139	10.4.144.139
71	10.4.144.140/31	10.4.144.140 – 10.4.144.141	10.4.144.141
72	10.4.144.142/31	10.4.144.142 – 10.4.144.143	10.4.144.143
73	10.4.144.144/31	10.4.144.144 – 10.4.144.145	10.4.144.145
74	10.4.144.146/31	10.4.144.146 – 10.4.144.147	10.4.144.147
75	10.4.144.148/31	10.4.144.148 – 10.4.144.149	10.4.144.149
76	10.4.144.150/31	10.4.144.150 – 10.4.144.151	10.4.144.151
77	10.4.144.152/31	10.4.144.152 – 10.4.144.153	10.4.144.153
78	10.4.144.154/31	10.4.144.154 – 10.4.144.155	10.4.144.155
79	10.4.144.156/31	10.4.144.156 – 10.4.144.157	10.4.144.157
80	10.4.144.158/31	10.4.144.158 – 10.4.144.159	10.4.144.159
81	10.4.144.160/31	10.4.144.160 – 10.4.144.161	10.4.144.161
82	10.4.144.162/31	10.4.144.162 – 10.4.144.163	10.4.144.163
83	10.4.144.164/31	10.4.144.164 – 10.4.144.165	10.4.144.165
84	10.4.144.166/31	10.4.144.166 – 10.4.144.167	10.4.144.167
85	10.4.144.168/31	10.4.144.168 – 10.4.144.169	10.4.144.169
86	10.4.144.170/31	10.4.144.170 – 10.4.144.171	10.4.144.171
87	10.4.144.172/31	10.4.144.172 – 10.4.144.173	10.4.144.173
88	10.4.144.174/31	10.4.144.174 – 10.4.144.175	10.4.144.175
89	10.4.144.176/31	10.4.144.176 – 10.4.144.177	10.4.144.177
90	10.4.144.178/31	10.4.144.178 – 10.4.144.179	10.4.144.179
91	10.4.144.180/31	10.4.144.180 – 10.4.144.181	10.4.144.181
92	10.4.144.182/31	10.4.144.182 – 10.4.144.183	10.4.144.183
93	10.4.144.184/31	10.4.144.184 – 10.4.144.185	10.4.144.185
94	10.4.144.186/31	10.4.144.186 – 10.4.144.187	10.4.144.187
95	10.4.144.188/31	10.4.144.188 – 10.4.144.189	10.4.144.189
96	10.4.144.190/31	10.4.144.190 – 10.4.144.191	10.4.144.191
97	10.4.144.192/31	10.4.144.192 – 10.4.144.193	10.4.144.193
98	10.4.144.194/31	10.4.144.194 – 10.4.144.195	10.4.144.195
99	10.4.144.196/31	10.4.144.196 – 10.4.144.197	10.4.144.197
100	10.4.144.198/31	10.4.144.198 – 10.4.144.199	10.4.144.199
101	10.4.144.200/31	10.4.144.200 – 10.4.144.201	10.4.144.201
102	10.4.144.202/31	10.4.144.202 – 10.4.144.203	10.4.144.203
103	10.4.144.204/31	10.4.144.204 – 10.4.144.205	10.4.144.205
104	10.4.144.206/31	10.4.144.206 – 10.4.144.207	10.4.144.207
105	10.4.144.208/31	10.4.144.208 – 10.4.144.209	10.4.144.209
106	10.4.144.210/31	10.4.144.210 – 10.4.144.211	10.4.144.211
107	10.4.144.212/31	10.4.144.212 – 10.4.144.213	10.4.144.213
108	10.4.144.214/31	10.4.144.214 – 10.4.144.215	10.4.144.215
109	10.4.144.216/31	10.4.144.216 – 10.4.144.217	10.4.144.217
110	10.4.144.218/31	10.4.144.218 – 10.4.144.219	10.4.144.219
111	10.4.144.220/31	10.4.144.220 – 10.4.144.221	10.4.144.221
112	10.4.144.222/31	10.4.144.222 – 10.4.144.223	10.4.144.223
113	10.4.144.224/31	10.4.144.224 – 10.4.144.225	10.4.144.225
114	10.4.144.226/31	10.4.144.226 – 10.4.144.227	10.4.144.227
115	10.4.144.228/31	10.4.144.228 – 10.4.144.229	10.4.144.229
116	10.4.144.230/31	10.4.144.230 – 10.4.144.231	10.4.144.231
117	10.4.144.232/31	10.4.144.232 – 10.4.144.233	10.4.144.233
118	10.4.144.234/31	10.4.144.234 – 10.4.144.235	10.4.144.235
119	10.4.144.236/31	10.4.144.236 – 10.4.144.237	10.4.144.237
120	10.4.144.238/31	10.4.144.238 – 10.4.144.239	10.4.144.239
121	10.4.144.240/31	10.4.144.240 – 10.4.144.241	10.4.144.241
122	10.4.144.242/31	10.4.144.242 – 10.4.144.243	10.4.144.243
123	10.4.144.244/31	10.4.144.244 – 10.4.144.245	10.4.144.245
124	10.4.144.246/31	10.4.144.246 – 10.4.144.247	10.4.144.247
125	10.4.144.248/31	10.4.144.248 – 10.4.144.249	10.4.144.249
126	10.4.144.250/31	10.4.144.250 – 10.4.144.251	10.4.144.251
127	10.4.144.252/31	10.4.144.252 – 10.4.144.253	10.4.144.253
128	10.4.144.254/31	10.4.144.254 – 10.4.144.255	10.4.144.255
129	10.4.145.0/31	10.4.145.0 – 10.4.145.1	10.4.145.1
130	10.4.145.2/31	10.4.145.2 – 10.4.145.3	10.4.145.3
131	10.4.145.4/31	10.4.145.4 – 10.4.145.5	10.4.145.5
132	10.4.145.6/31	10.4.145.6 – 10.4.145.7	10.4.145.7
133	10.4.145.8/31	10.4.145.8 – 10.4.145.9	10.4.145.9
134	10.4.145.10/31	10.4.145.10 – 10.4.145.11	10.4.145.11
135	10.4.145.12/31	10.4.145.12 – 10.4.145.13	10.4.145.13
136	10.4.145.14/31	10.4.145.14 – 10.4.145.15	10.4.145.15
137	10.4.145.16/31	10.4.145.16 – 10.4.145.17	10.4.145.17
138	10.4.145.18/31	10.4.145.18 – 10.4.145.19	10.4.145.19
139	10.4.145.20/31	10.4.145.20 – 10.4.145.21	10.4.145.21
140	10.4.145.22/31	10.4.145.22 – 10.4.145.23	10.4.145.23
141	10.4.145.24/31	10.4.145.24 – 10.4.145.25	10.4.145.25
142	10.4.145.26/31	10.4.145.26 – 10.4.145.27	10.4.145.27
143	10.4.145.28/31	10.4.145.28 – 10.4.145.29	10.4.145.29
144	10.4.145.30/31	10.4.145.30 – 10.4.145.31	10.4.145.31
145	10.4.145.32/31	10.4.145.32 – 10.4.145.33	10.4.145.33
146	10.4.145.34/31	10.4.145.34 – 10.4.145.35	10.4.145.35
147	10.4.145.36/31	10.4.145.36 – 10.4.145.37	10.4.145.37
148	10.4.145.38/31	10.4.145.38 – 10.4.145.39	10.4.145.39
149	10.4.145.40/31	10.4.145.40 – 10.4.145.41	10.4.145.41
150	10.4.145.42/31	10.4.145.42 – 10.4.145.43	10.4.145.43
151	10.4.145.44/31	10.4.145.44 – 10.4.145.45	10.4.145.45
152	10.4.145.46/31	10.4.145.46 – 10.4.145.47	10.4.145.47
153	10.4.145.48/31	10.4.145.48 – 10.4.145.49	10.4.145.49
154	10.4.145.50/31	10.4.145.50 – 10.4.145.51	10.4.145.51
155	10.4.145.52/31	10.4.145.52 – 10.4.145.53	10.4.145.53
156	10.4.145.54/31	10.4.145.54 – 10.4.145.55	10.4.145.55
157	10.4.145.56/31	10.4.145.56 – 10.4.145.57	10.4.145.57
158	10.4.145.58/31	10.4.145.58 – 10.4.145.59	10.4.145.59
159	10.4.145.60/31	10.4.145.60 – 10.4.145.61	10.4.145.61
160	10.4.145.62/31	10.4.145.62 – 10.4.145.63	10.4.145.63
161	10.4.145.64/31	10.4.145.64 – 10.4.145.65	10.4.145.65
162	10.4.145.66/31	10.4.145.66 – 10.4.145.67	10.4.145.67
163	10.4.145.68/31	10.4.145.68 – 10.4.145.69	10.4.145.69
164	10.4.145.70/31	10.4.145.70 – 10.4.145.71	10.4.145.71
165	10.4.145.72/31	10.4.145.72 – 10.4.145.73	10.4.145.73
166	10.4.145.74/31	10.4.145.74 – 10.4.145.75	10.4.145.75
167	10.4.145.76/31	10.4.145.76 – 10.4.145.77	10.4.145.77
168	10.4.145.78/31	10.4.145.78 – 10.4.145.79	10.4.145.79
169	10.4.145.80/31	10.4.145.80 – 10.4.145.81	10.4.145.81
170	10.4.145.82/31	10.4.145.82 – 10.4.145.83	10.4.145.83
171	10.4.145.84/31	10.4.145.84 – 10.4.145.85	10.4.145.85
172	10.4.145.86/31	10.4.145.86 – 10.4.145.87	10.4.145.87
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174	10.4.145.90/31	10.4.145.90 – 10.4.145.91	10.4.145.91
175	10.4.145.92/31	10.4.145.92 – 10.4.145.93	10.4.145.93
176	10.4.145.94/31	10.4.145.94 – 10.4.145.95	10.4.145.95
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187	10.4.145.116/31	10.4.145.116 – 10.4.145.117	10.4.145.117
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196	10.4.145.134/31	10.4.145.134 – 10.4.145.135	10.4.145.135
197	10.4.145.136/31	10.4.145.136 – 10.4.145.137	10.4.145.137
198	10.4.145.138/31	10.4.145.138 – 10.4.145.139	10.4.145.139
199	10.4.145.140/31	10.4.145.140 – 10.4.145.141	10.4.145.141
200	10.4.145.142/31	10.4.145.142 – 10.4.145.143	10.4.145.143
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202	10.4.145.146/31	10.4.145.146 – 10.4.145.147	10.4.145.147
203	10.4.145.148/31	10.4.145.148 – 10.4.145.149	10.4.145.149
204	10.4.145.150/31	10.4.145.150 – 10.4.145.151	10.4.145.151
205	10.4.145.152/31	10.4.145.152 – 10.4.145.153	10.4.145.153
206	10.4.145.154/31	10.4.145.154 – 10.4.145.155	10.4.145.155
207	10.4.145.156/31	10.4.145.156 – 10.4.145.157	10.4.145.157
208	10.4.145.158/31	10.4.145.158 – 10.4.145.159	10.4.145.159
209	10.4.145.160/31	10.4.145.160 – 10.4.145.161	10.4.145.161
210	10.4.145.162/31	10.4.145.162 – 10.4.145.163	10.4.145.163
211	10.4.145.164/31	10.4.145.164 – 10.4.145.165	10.4.145.165
212	10.4.145.166/31	10.4.145.166 – 10.4.145.167	10.4.145.167
213	10.4.145.168/31	10.4.145.168 – 10.4.145.169	10.4.145.169
214	10.4.145.170/31	10.4.145.170 – 10.4.145.171	10.4.145.171
215	10.4.145.172/31	10.4.145.172 – 10.4.145.173	10.4.145.173
216	10.4.145.174/31	10.4.145.174 – 10.4.145.175	10.4.145.175
217	10.4.145.176/31	10.4.145.176 – 10.4.145.177	10.4.145.177
218	10.4.145.178/31	10.4.145.178 – 10.4.145.179	10.4.145.179
219	10.4.145.180/31	10.4.145.180 – 10.4.145.181	10.4.145.181
220	10.4.145.182/31	10.4.145.182 – 10.4.145.183	10.4.145.183
221	10.4.145.184/31	10.4.145.184 – 10.4.145.185	10.4.145.185
222	10.4.145.186/31	10.4.145.186 – 10.4.145.187	10.4.145.187
223	10.4.145.188/31	10.4.145.188 – 10.4.145.189	10.4.145.189
224	10.4.145.190/31	10.4.145.190 – 10.4.145.191	10.4.145.191
225	10.4.145.192/31	10.4.145.192 – 10.4.145.193	10.4.145.193
226	10.4.145.194/31	10.4.145.194 – 10.4.145.195	10.4.145.195
227	10.4.145.196/31	10.4.145.196 – 10.4.145.197	10.4.145.197
228	10.4.145.198/31	10.4.145.198 – 10.4.145.199	10.4.145.199
229	10.4.145.200/31	10.4.145.200 – 10.4.145.201	10.4.145.201
230	10.4.145.202/31	10.4.145.202 – 10.4.145.203	10.4.145.203
231	10.4.145.204/31	10.4.145.204 – 10.4.145.205	10.4.145.205
232	10.4.145.206/31	10.4.145.206 – 10.4.145.207	10.4.145.207
233	10.4.145.208/31	10.4.145.208 – 10.4.145.209	10.4.145.209
234	10.4.145.210/31	10.4.145.210 – 10.4.145.211	10.4.145.211
235	10.4.145.212/31	10.4.145.212 – 10.4.145.213	10.4.145.213
236	10.4.145.214/31	10.4.145.214 – 10.4.145.215	10.4.145.215
237	10.4.145.216/31	10.4.145.216 – 10.4.145.217	10.4.145.217
238	10.4.145.218/31	10.4.145.218 – 10.4.145.219	10.4.145.219
239	10.4.145.220/31	10.4.145.220 – 10.4.145.221	10.4.145.221
240	10.4.145.222/31	10.4.145.222 – 10.4.145.223	10.4.145.223
241	10.4.145.224/31	10.4.145.224 – 10.4.145.225	10.4.145.225
242	10.4.145.226/31	10.4.145.226 – 10.4.145.227	10.4.145.227
243	10.4.145.228/31	10.4.145.228 – 10.4.145.229	10.4.145.229
244	10.4.145.230/31	10.4.145.230 – 10.4.145.231	10.4.145.231
245	10.4.145.232/31	10.4.145.232 – 10.4.145.233	10.4.145.233
246	10.4.145.234/31	10.4.145.234 – 10.4.145.235	10.4.145.235
247	10.4.145.236/31	10.4.145.236 – 10.4.145.237	10.4.145.237
248	10.4.145.238/31	10.4.145.238 – 10.4.145.239	10.4.145.239
249	10.4.145.240/31	10.4.145.240 – 10.4.145.241	10.4.145.241
250	10.4.145.242/31	10.4.145.242 – 10.4.145.243	10.4.145.243
251	10.4.145.244/31	10.4.145.244 – 10.4.145.245	10.4.145.245
252	10.4.145.246/31	10.4.145.246 – 10.4.145.247	10.4.145.247
253	10.4.145.248/31	10.4.145.248 – 10.4.145.249	10.4.145.249
254	10.4.145.250/31	10.4.145.250 – 10.4.145.251	10.4.145.251
255	10.4.145.252/31	10.4.145.252 – 10.4.145.253	10.4.145.253
256	10.4.145.254/31	10.4.145.254 – 10.4.145.255	10.4.145.255

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 →