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)10.0.208.0/21

network10.0.208.0/21

broadcast10.0.215.255

first host10.0.208.1

last host10.0.215.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.0.208.0/21

address00001010.00000000.11010000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000000.11010000.00000000

broadcast00001010.00000000.11010111.11111111

green = network part, grey = host part

hex0x0a00d000

decimal167825408

reverse dns0.208.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:d000

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.0.208.0/31	10.0.208.0 – 10.0.208.1	10.0.208.1
2	10.0.208.2/31	10.0.208.2 – 10.0.208.3	10.0.208.3
3	10.0.208.4/31	10.0.208.4 – 10.0.208.5	10.0.208.5
4	10.0.208.6/31	10.0.208.6 – 10.0.208.7	10.0.208.7
5	10.0.208.8/31	10.0.208.8 – 10.0.208.9	10.0.208.9
6	10.0.208.10/31	10.0.208.10 – 10.0.208.11	10.0.208.11
7	10.0.208.12/31	10.0.208.12 – 10.0.208.13	10.0.208.13
8	10.0.208.14/31	10.0.208.14 – 10.0.208.15	10.0.208.15
9	10.0.208.16/31	10.0.208.16 – 10.0.208.17	10.0.208.17
10	10.0.208.18/31	10.0.208.18 – 10.0.208.19	10.0.208.19
11	10.0.208.20/31	10.0.208.20 – 10.0.208.21	10.0.208.21
12	10.0.208.22/31	10.0.208.22 – 10.0.208.23	10.0.208.23
13	10.0.208.24/31	10.0.208.24 – 10.0.208.25	10.0.208.25
14	10.0.208.26/31	10.0.208.26 – 10.0.208.27	10.0.208.27
15	10.0.208.28/31	10.0.208.28 – 10.0.208.29	10.0.208.29
16	10.0.208.30/31	10.0.208.30 – 10.0.208.31	10.0.208.31
17	10.0.208.32/31	10.0.208.32 – 10.0.208.33	10.0.208.33
18	10.0.208.34/31	10.0.208.34 – 10.0.208.35	10.0.208.35
19	10.0.208.36/31	10.0.208.36 – 10.0.208.37	10.0.208.37
20	10.0.208.38/31	10.0.208.38 – 10.0.208.39	10.0.208.39
21	10.0.208.40/31	10.0.208.40 – 10.0.208.41	10.0.208.41
22	10.0.208.42/31	10.0.208.42 – 10.0.208.43	10.0.208.43
23	10.0.208.44/31	10.0.208.44 – 10.0.208.45	10.0.208.45
24	10.0.208.46/31	10.0.208.46 – 10.0.208.47	10.0.208.47
25	10.0.208.48/31	10.0.208.48 – 10.0.208.49	10.0.208.49
26	10.0.208.50/31	10.0.208.50 – 10.0.208.51	10.0.208.51
27	10.0.208.52/31	10.0.208.52 – 10.0.208.53	10.0.208.53
28	10.0.208.54/31	10.0.208.54 – 10.0.208.55	10.0.208.55
29	10.0.208.56/31	10.0.208.56 – 10.0.208.57	10.0.208.57
30	10.0.208.58/31	10.0.208.58 – 10.0.208.59	10.0.208.59
31	10.0.208.60/31	10.0.208.60 – 10.0.208.61	10.0.208.61
32	10.0.208.62/31	10.0.208.62 – 10.0.208.63	10.0.208.63
33	10.0.208.64/31	10.0.208.64 – 10.0.208.65	10.0.208.65
34	10.0.208.66/31	10.0.208.66 – 10.0.208.67	10.0.208.67
35	10.0.208.68/31	10.0.208.68 – 10.0.208.69	10.0.208.69
36	10.0.208.70/31	10.0.208.70 – 10.0.208.71	10.0.208.71
37	10.0.208.72/31	10.0.208.72 – 10.0.208.73	10.0.208.73
38	10.0.208.74/31	10.0.208.74 – 10.0.208.75	10.0.208.75
39	10.0.208.76/31	10.0.208.76 – 10.0.208.77	10.0.208.77
40	10.0.208.78/31	10.0.208.78 – 10.0.208.79	10.0.208.79
41	10.0.208.80/31	10.0.208.80 – 10.0.208.81	10.0.208.81
42	10.0.208.82/31	10.0.208.82 – 10.0.208.83	10.0.208.83
43	10.0.208.84/31	10.0.208.84 – 10.0.208.85	10.0.208.85
44	10.0.208.86/31	10.0.208.86 – 10.0.208.87	10.0.208.87
45	10.0.208.88/31	10.0.208.88 – 10.0.208.89	10.0.208.89
46	10.0.208.90/31	10.0.208.90 – 10.0.208.91	10.0.208.91
47	10.0.208.92/31	10.0.208.92 – 10.0.208.93	10.0.208.93
48	10.0.208.94/31	10.0.208.94 – 10.0.208.95	10.0.208.95
49	10.0.208.96/31	10.0.208.96 – 10.0.208.97	10.0.208.97
50	10.0.208.98/31	10.0.208.98 – 10.0.208.99	10.0.208.99
51	10.0.208.100/31	10.0.208.100 – 10.0.208.101	10.0.208.101
52	10.0.208.102/31	10.0.208.102 – 10.0.208.103	10.0.208.103
53	10.0.208.104/31	10.0.208.104 – 10.0.208.105	10.0.208.105
54	10.0.208.106/31	10.0.208.106 – 10.0.208.107	10.0.208.107
55	10.0.208.108/31	10.0.208.108 – 10.0.208.109	10.0.208.109
56	10.0.208.110/31	10.0.208.110 – 10.0.208.111	10.0.208.111
57	10.0.208.112/31	10.0.208.112 – 10.0.208.113	10.0.208.113
58	10.0.208.114/31	10.0.208.114 – 10.0.208.115	10.0.208.115
59	10.0.208.116/31	10.0.208.116 – 10.0.208.117	10.0.208.117
60	10.0.208.118/31	10.0.208.118 – 10.0.208.119	10.0.208.119
61	10.0.208.120/31	10.0.208.120 – 10.0.208.121	10.0.208.121
62	10.0.208.122/31	10.0.208.122 – 10.0.208.123	10.0.208.123
63	10.0.208.124/31	10.0.208.124 – 10.0.208.125	10.0.208.125
64	10.0.208.126/31	10.0.208.126 – 10.0.208.127	10.0.208.127
65	10.0.208.128/31	10.0.208.128 – 10.0.208.129	10.0.208.129
66	10.0.208.130/31	10.0.208.130 – 10.0.208.131	10.0.208.131
67	10.0.208.132/31	10.0.208.132 – 10.0.208.133	10.0.208.133
68	10.0.208.134/31	10.0.208.134 – 10.0.208.135	10.0.208.135
69	10.0.208.136/31	10.0.208.136 – 10.0.208.137	10.0.208.137
70	10.0.208.138/31	10.0.208.138 – 10.0.208.139	10.0.208.139
71	10.0.208.140/31	10.0.208.140 – 10.0.208.141	10.0.208.141
72	10.0.208.142/31	10.0.208.142 – 10.0.208.143	10.0.208.143
73	10.0.208.144/31	10.0.208.144 – 10.0.208.145	10.0.208.145
74	10.0.208.146/31	10.0.208.146 – 10.0.208.147	10.0.208.147
75	10.0.208.148/31	10.0.208.148 – 10.0.208.149	10.0.208.149
76	10.0.208.150/31	10.0.208.150 – 10.0.208.151	10.0.208.151
77	10.0.208.152/31	10.0.208.152 – 10.0.208.153	10.0.208.153
78	10.0.208.154/31	10.0.208.154 – 10.0.208.155	10.0.208.155
79	10.0.208.156/31	10.0.208.156 – 10.0.208.157	10.0.208.157
80	10.0.208.158/31	10.0.208.158 – 10.0.208.159	10.0.208.159
81	10.0.208.160/31	10.0.208.160 – 10.0.208.161	10.0.208.161
82	10.0.208.162/31	10.0.208.162 – 10.0.208.163	10.0.208.163
83	10.0.208.164/31	10.0.208.164 – 10.0.208.165	10.0.208.165
84	10.0.208.166/31	10.0.208.166 – 10.0.208.167	10.0.208.167
85	10.0.208.168/31	10.0.208.168 – 10.0.208.169	10.0.208.169
86	10.0.208.170/31	10.0.208.170 – 10.0.208.171	10.0.208.171
87	10.0.208.172/31	10.0.208.172 – 10.0.208.173	10.0.208.173
88	10.0.208.174/31	10.0.208.174 – 10.0.208.175	10.0.208.175
89	10.0.208.176/31	10.0.208.176 – 10.0.208.177	10.0.208.177
90	10.0.208.178/31	10.0.208.178 – 10.0.208.179	10.0.208.179
91	10.0.208.180/31	10.0.208.180 – 10.0.208.181	10.0.208.181
92	10.0.208.182/31	10.0.208.182 – 10.0.208.183	10.0.208.183
93	10.0.208.184/31	10.0.208.184 – 10.0.208.185	10.0.208.185
94	10.0.208.186/31	10.0.208.186 – 10.0.208.187	10.0.208.187
95	10.0.208.188/31	10.0.208.188 – 10.0.208.189	10.0.208.189
96	10.0.208.190/31	10.0.208.190 – 10.0.208.191	10.0.208.191
97	10.0.208.192/31	10.0.208.192 – 10.0.208.193	10.0.208.193
98	10.0.208.194/31	10.0.208.194 – 10.0.208.195	10.0.208.195
99	10.0.208.196/31	10.0.208.196 – 10.0.208.197	10.0.208.197
100	10.0.208.198/31	10.0.208.198 – 10.0.208.199	10.0.208.199
101	10.0.208.200/31	10.0.208.200 – 10.0.208.201	10.0.208.201
102	10.0.208.202/31	10.0.208.202 – 10.0.208.203	10.0.208.203
103	10.0.208.204/31	10.0.208.204 – 10.0.208.205	10.0.208.205
104	10.0.208.206/31	10.0.208.206 – 10.0.208.207	10.0.208.207
105	10.0.208.208/31	10.0.208.208 – 10.0.208.209	10.0.208.209
106	10.0.208.210/31	10.0.208.210 – 10.0.208.211	10.0.208.211
107	10.0.208.212/31	10.0.208.212 – 10.0.208.213	10.0.208.213
108	10.0.208.214/31	10.0.208.214 – 10.0.208.215	10.0.208.215
109	10.0.208.216/31	10.0.208.216 – 10.0.208.217	10.0.208.217
110	10.0.208.218/31	10.0.208.218 – 10.0.208.219	10.0.208.219
111	10.0.208.220/31	10.0.208.220 – 10.0.208.221	10.0.208.221
112	10.0.208.222/31	10.0.208.222 – 10.0.208.223	10.0.208.223
113	10.0.208.224/31	10.0.208.224 – 10.0.208.225	10.0.208.225
114	10.0.208.226/31	10.0.208.226 – 10.0.208.227	10.0.208.227
115	10.0.208.228/31	10.0.208.228 – 10.0.208.229	10.0.208.229
116	10.0.208.230/31	10.0.208.230 – 10.0.208.231	10.0.208.231
117	10.0.208.232/31	10.0.208.232 – 10.0.208.233	10.0.208.233
118	10.0.208.234/31	10.0.208.234 – 10.0.208.235	10.0.208.235
119	10.0.208.236/31	10.0.208.236 – 10.0.208.237	10.0.208.237
120	10.0.208.238/31	10.0.208.238 – 10.0.208.239	10.0.208.239
121	10.0.208.240/31	10.0.208.240 – 10.0.208.241	10.0.208.241
122	10.0.208.242/31	10.0.208.242 – 10.0.208.243	10.0.208.243
123	10.0.208.244/31	10.0.208.244 – 10.0.208.245	10.0.208.245
124	10.0.208.246/31	10.0.208.246 – 10.0.208.247	10.0.208.247
125	10.0.208.248/31	10.0.208.248 – 10.0.208.249	10.0.208.249
126	10.0.208.250/31	10.0.208.250 – 10.0.208.251	10.0.208.251
127	10.0.208.252/31	10.0.208.252 – 10.0.208.253	10.0.208.253
128	10.0.208.254/31	10.0.208.254 – 10.0.208.255	10.0.208.255
129	10.0.209.0/31	10.0.209.0 – 10.0.209.1	10.0.209.1
130	10.0.209.2/31	10.0.209.2 – 10.0.209.3	10.0.209.3
131	10.0.209.4/31	10.0.209.4 – 10.0.209.5	10.0.209.5
132	10.0.209.6/31	10.0.209.6 – 10.0.209.7	10.0.209.7
133	10.0.209.8/31	10.0.209.8 – 10.0.209.9	10.0.209.9
134	10.0.209.10/31	10.0.209.10 – 10.0.209.11	10.0.209.11
135	10.0.209.12/31	10.0.209.12 – 10.0.209.13	10.0.209.13
136	10.0.209.14/31	10.0.209.14 – 10.0.209.15	10.0.209.15
137	10.0.209.16/31	10.0.209.16 – 10.0.209.17	10.0.209.17
138	10.0.209.18/31	10.0.209.18 – 10.0.209.19	10.0.209.19
139	10.0.209.20/31	10.0.209.20 – 10.0.209.21	10.0.209.21
140	10.0.209.22/31	10.0.209.22 – 10.0.209.23	10.0.209.23
141	10.0.209.24/31	10.0.209.24 – 10.0.209.25	10.0.209.25
142	10.0.209.26/31	10.0.209.26 – 10.0.209.27	10.0.209.27
143	10.0.209.28/31	10.0.209.28 – 10.0.209.29	10.0.209.29
144	10.0.209.30/31	10.0.209.30 – 10.0.209.31	10.0.209.31
145	10.0.209.32/31	10.0.209.32 – 10.0.209.33	10.0.209.33
146	10.0.209.34/31	10.0.209.34 – 10.0.209.35	10.0.209.35
147	10.0.209.36/31	10.0.209.36 – 10.0.209.37	10.0.209.37
148	10.0.209.38/31	10.0.209.38 – 10.0.209.39	10.0.209.39
149	10.0.209.40/31	10.0.209.40 – 10.0.209.41	10.0.209.41
150	10.0.209.42/31	10.0.209.42 – 10.0.209.43	10.0.209.43
151	10.0.209.44/31	10.0.209.44 – 10.0.209.45	10.0.209.45
152	10.0.209.46/31	10.0.209.46 – 10.0.209.47	10.0.209.47
153	10.0.209.48/31	10.0.209.48 – 10.0.209.49	10.0.209.49
154	10.0.209.50/31	10.0.209.50 – 10.0.209.51	10.0.209.51
155	10.0.209.52/31	10.0.209.52 – 10.0.209.53	10.0.209.53
156	10.0.209.54/31	10.0.209.54 – 10.0.209.55	10.0.209.55
157	10.0.209.56/31	10.0.209.56 – 10.0.209.57	10.0.209.57
158	10.0.209.58/31	10.0.209.58 – 10.0.209.59	10.0.209.59
159	10.0.209.60/31	10.0.209.60 – 10.0.209.61	10.0.209.61
160	10.0.209.62/31	10.0.209.62 – 10.0.209.63	10.0.209.63
161	10.0.209.64/31	10.0.209.64 – 10.0.209.65	10.0.209.65
162	10.0.209.66/31	10.0.209.66 – 10.0.209.67	10.0.209.67
163	10.0.209.68/31	10.0.209.68 – 10.0.209.69	10.0.209.69
164	10.0.209.70/31	10.0.209.70 – 10.0.209.71	10.0.209.71
165	10.0.209.72/31	10.0.209.72 – 10.0.209.73	10.0.209.73
166	10.0.209.74/31	10.0.209.74 – 10.0.209.75	10.0.209.75
167	10.0.209.76/31	10.0.209.76 – 10.0.209.77	10.0.209.77
168	10.0.209.78/31	10.0.209.78 – 10.0.209.79	10.0.209.79
169	10.0.209.80/31	10.0.209.80 – 10.0.209.81	10.0.209.81
170	10.0.209.82/31	10.0.209.82 – 10.0.209.83	10.0.209.83
171	10.0.209.84/31	10.0.209.84 – 10.0.209.85	10.0.209.85
172	10.0.209.86/31	10.0.209.86 – 10.0.209.87	10.0.209.87
173	10.0.209.88/31	10.0.209.88 – 10.0.209.89	10.0.209.89
174	10.0.209.90/31	10.0.209.90 – 10.0.209.91	10.0.209.91
175	10.0.209.92/31	10.0.209.92 – 10.0.209.93	10.0.209.93
176	10.0.209.94/31	10.0.209.94 – 10.0.209.95	10.0.209.95
177	10.0.209.96/31	10.0.209.96 – 10.0.209.97	10.0.209.97
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196	10.0.209.134/31	10.0.209.134 – 10.0.209.135	10.0.209.135
197	10.0.209.136/31	10.0.209.136 – 10.0.209.137	10.0.209.137
198	10.0.209.138/31	10.0.209.138 – 10.0.209.139	10.0.209.139
199	10.0.209.140/31	10.0.209.140 – 10.0.209.141	10.0.209.141
200	10.0.209.142/31	10.0.209.142 – 10.0.209.143	10.0.209.143
201	10.0.209.144/31	10.0.209.144 – 10.0.209.145	10.0.209.145
202	10.0.209.146/31	10.0.209.146 – 10.0.209.147	10.0.209.147
203	10.0.209.148/31	10.0.209.148 – 10.0.209.149	10.0.209.149
204	10.0.209.150/31	10.0.209.150 – 10.0.209.151	10.0.209.151
205	10.0.209.152/31	10.0.209.152 – 10.0.209.153	10.0.209.153
206	10.0.209.154/31	10.0.209.154 – 10.0.209.155	10.0.209.155
207	10.0.209.156/31	10.0.209.156 – 10.0.209.157	10.0.209.157
208	10.0.209.158/31	10.0.209.158 – 10.0.209.159	10.0.209.159
209	10.0.209.160/31	10.0.209.160 – 10.0.209.161	10.0.209.161
210	10.0.209.162/31	10.0.209.162 – 10.0.209.163	10.0.209.163
211	10.0.209.164/31	10.0.209.164 – 10.0.209.165	10.0.209.165
212	10.0.209.166/31	10.0.209.166 – 10.0.209.167	10.0.209.167
213	10.0.209.168/31	10.0.209.168 – 10.0.209.169	10.0.209.169
214	10.0.209.170/31	10.0.209.170 – 10.0.209.171	10.0.209.171
215	10.0.209.172/31	10.0.209.172 – 10.0.209.173	10.0.209.173
216	10.0.209.174/31	10.0.209.174 – 10.0.209.175	10.0.209.175
217	10.0.209.176/31	10.0.209.176 – 10.0.209.177	10.0.209.177
218	10.0.209.178/31	10.0.209.178 – 10.0.209.179	10.0.209.179
219	10.0.209.180/31	10.0.209.180 – 10.0.209.181	10.0.209.181
220	10.0.209.182/31	10.0.209.182 – 10.0.209.183	10.0.209.183
221	10.0.209.184/31	10.0.209.184 – 10.0.209.185	10.0.209.185
222	10.0.209.186/31	10.0.209.186 – 10.0.209.187	10.0.209.187
223	10.0.209.188/31	10.0.209.188 – 10.0.209.189	10.0.209.189
224	10.0.209.190/31	10.0.209.190 – 10.0.209.191	10.0.209.191
225	10.0.209.192/31	10.0.209.192 – 10.0.209.193	10.0.209.193
226	10.0.209.194/31	10.0.209.194 – 10.0.209.195	10.0.209.195
227	10.0.209.196/31	10.0.209.196 – 10.0.209.197	10.0.209.197
228	10.0.209.198/31	10.0.209.198 – 10.0.209.199	10.0.209.199
229	10.0.209.200/31	10.0.209.200 – 10.0.209.201	10.0.209.201
230	10.0.209.202/31	10.0.209.202 – 10.0.209.203	10.0.209.203
231	10.0.209.204/31	10.0.209.204 – 10.0.209.205	10.0.209.205
232	10.0.209.206/31	10.0.209.206 – 10.0.209.207	10.0.209.207
233	10.0.209.208/31	10.0.209.208 – 10.0.209.209	10.0.209.209
234	10.0.209.210/31	10.0.209.210 – 10.0.209.211	10.0.209.211
235	10.0.209.212/31	10.0.209.212 – 10.0.209.213	10.0.209.213
236	10.0.209.214/31	10.0.209.214 – 10.0.209.215	10.0.209.215
237	10.0.209.216/31	10.0.209.216 – 10.0.209.217	10.0.209.217
238	10.0.209.218/31	10.0.209.218 – 10.0.209.219	10.0.209.219
239	10.0.209.220/31	10.0.209.220 – 10.0.209.221	10.0.209.221
240	10.0.209.222/31	10.0.209.222 – 10.0.209.223	10.0.209.223
241	10.0.209.224/31	10.0.209.224 – 10.0.209.225	10.0.209.225
242	10.0.209.226/31	10.0.209.226 – 10.0.209.227	10.0.209.227
243	10.0.209.228/31	10.0.209.228 – 10.0.209.229	10.0.209.229
244	10.0.209.230/31	10.0.209.230 – 10.0.209.231	10.0.209.231
245	10.0.209.232/31	10.0.209.232 – 10.0.209.233	10.0.209.233
246	10.0.209.234/31	10.0.209.234 – 10.0.209.235	10.0.209.235
247	10.0.209.236/31	10.0.209.236 – 10.0.209.237	10.0.209.237
248	10.0.209.238/31	10.0.209.238 – 10.0.209.239	10.0.209.239
249	10.0.209.240/31	10.0.209.240 – 10.0.209.241	10.0.209.241
250	10.0.209.242/31	10.0.209.242 – 10.0.209.243	10.0.209.243
251	10.0.209.244/31	10.0.209.244 – 10.0.209.245	10.0.209.245
252	10.0.209.246/31	10.0.209.246 – 10.0.209.247	10.0.209.247
253	10.0.209.248/31	10.0.209.248 – 10.0.209.249	10.0.209.249
254	10.0.209.250/31	10.0.209.250 – 10.0.209.251	10.0.209.251
255	10.0.209.252/31	10.0.209.252 – 10.0.209.253	10.0.209.253
256	10.0.209.254/31	10.0.209.254 – 10.0.209.255	10.0.209.255

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 →