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)10.4.168.0/21

network10.4.168.0/21

broadcast10.4.175.255

first host10.4.168.1

last host10.4.175.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.168.0/21

address00001010.00000100.10101000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.10101000.00000000

broadcast00001010.00000100.10101111.11111111

green = network part, grey = host part

hex0x0a04a800

decimal168077312

reverse dns0.168.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:a800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.4.168.0/31	10.4.168.0 – 10.4.168.1	10.4.168.1
2	10.4.168.2/31	10.4.168.2 – 10.4.168.3	10.4.168.3
3	10.4.168.4/31	10.4.168.4 – 10.4.168.5	10.4.168.5
4	10.4.168.6/31	10.4.168.6 – 10.4.168.7	10.4.168.7
5	10.4.168.8/31	10.4.168.8 – 10.4.168.9	10.4.168.9
6	10.4.168.10/31	10.4.168.10 – 10.4.168.11	10.4.168.11
7	10.4.168.12/31	10.4.168.12 – 10.4.168.13	10.4.168.13
8	10.4.168.14/31	10.4.168.14 – 10.4.168.15	10.4.168.15
9	10.4.168.16/31	10.4.168.16 – 10.4.168.17	10.4.168.17
10	10.4.168.18/31	10.4.168.18 – 10.4.168.19	10.4.168.19
11	10.4.168.20/31	10.4.168.20 – 10.4.168.21	10.4.168.21
12	10.4.168.22/31	10.4.168.22 – 10.4.168.23	10.4.168.23
13	10.4.168.24/31	10.4.168.24 – 10.4.168.25	10.4.168.25
14	10.4.168.26/31	10.4.168.26 – 10.4.168.27	10.4.168.27
15	10.4.168.28/31	10.4.168.28 – 10.4.168.29	10.4.168.29
16	10.4.168.30/31	10.4.168.30 – 10.4.168.31	10.4.168.31
17	10.4.168.32/31	10.4.168.32 – 10.4.168.33	10.4.168.33
18	10.4.168.34/31	10.4.168.34 – 10.4.168.35	10.4.168.35
19	10.4.168.36/31	10.4.168.36 – 10.4.168.37	10.4.168.37
20	10.4.168.38/31	10.4.168.38 – 10.4.168.39	10.4.168.39
21	10.4.168.40/31	10.4.168.40 – 10.4.168.41	10.4.168.41
22	10.4.168.42/31	10.4.168.42 – 10.4.168.43	10.4.168.43
23	10.4.168.44/31	10.4.168.44 – 10.4.168.45	10.4.168.45
24	10.4.168.46/31	10.4.168.46 – 10.4.168.47	10.4.168.47
25	10.4.168.48/31	10.4.168.48 – 10.4.168.49	10.4.168.49
26	10.4.168.50/31	10.4.168.50 – 10.4.168.51	10.4.168.51
27	10.4.168.52/31	10.4.168.52 – 10.4.168.53	10.4.168.53
28	10.4.168.54/31	10.4.168.54 – 10.4.168.55	10.4.168.55
29	10.4.168.56/31	10.4.168.56 – 10.4.168.57	10.4.168.57
30	10.4.168.58/31	10.4.168.58 – 10.4.168.59	10.4.168.59
31	10.4.168.60/31	10.4.168.60 – 10.4.168.61	10.4.168.61
32	10.4.168.62/31	10.4.168.62 – 10.4.168.63	10.4.168.63
33	10.4.168.64/31	10.4.168.64 – 10.4.168.65	10.4.168.65
34	10.4.168.66/31	10.4.168.66 – 10.4.168.67	10.4.168.67
35	10.4.168.68/31	10.4.168.68 – 10.4.168.69	10.4.168.69
36	10.4.168.70/31	10.4.168.70 – 10.4.168.71	10.4.168.71
37	10.4.168.72/31	10.4.168.72 – 10.4.168.73	10.4.168.73
38	10.4.168.74/31	10.4.168.74 – 10.4.168.75	10.4.168.75
39	10.4.168.76/31	10.4.168.76 – 10.4.168.77	10.4.168.77
40	10.4.168.78/31	10.4.168.78 – 10.4.168.79	10.4.168.79
41	10.4.168.80/31	10.4.168.80 – 10.4.168.81	10.4.168.81
42	10.4.168.82/31	10.4.168.82 – 10.4.168.83	10.4.168.83
43	10.4.168.84/31	10.4.168.84 – 10.4.168.85	10.4.168.85
44	10.4.168.86/31	10.4.168.86 – 10.4.168.87	10.4.168.87
45	10.4.168.88/31	10.4.168.88 – 10.4.168.89	10.4.168.89
46	10.4.168.90/31	10.4.168.90 – 10.4.168.91	10.4.168.91
47	10.4.168.92/31	10.4.168.92 – 10.4.168.93	10.4.168.93
48	10.4.168.94/31	10.4.168.94 – 10.4.168.95	10.4.168.95
49	10.4.168.96/31	10.4.168.96 – 10.4.168.97	10.4.168.97
50	10.4.168.98/31	10.4.168.98 – 10.4.168.99	10.4.168.99
51	10.4.168.100/31	10.4.168.100 – 10.4.168.101	10.4.168.101
52	10.4.168.102/31	10.4.168.102 – 10.4.168.103	10.4.168.103
53	10.4.168.104/31	10.4.168.104 – 10.4.168.105	10.4.168.105
54	10.4.168.106/31	10.4.168.106 – 10.4.168.107	10.4.168.107
55	10.4.168.108/31	10.4.168.108 – 10.4.168.109	10.4.168.109
56	10.4.168.110/31	10.4.168.110 – 10.4.168.111	10.4.168.111
57	10.4.168.112/31	10.4.168.112 – 10.4.168.113	10.4.168.113
58	10.4.168.114/31	10.4.168.114 – 10.4.168.115	10.4.168.115
59	10.4.168.116/31	10.4.168.116 – 10.4.168.117	10.4.168.117
60	10.4.168.118/31	10.4.168.118 – 10.4.168.119	10.4.168.119
61	10.4.168.120/31	10.4.168.120 – 10.4.168.121	10.4.168.121
62	10.4.168.122/31	10.4.168.122 – 10.4.168.123	10.4.168.123
63	10.4.168.124/31	10.4.168.124 – 10.4.168.125	10.4.168.125
64	10.4.168.126/31	10.4.168.126 – 10.4.168.127	10.4.168.127
65	10.4.168.128/31	10.4.168.128 – 10.4.168.129	10.4.168.129
66	10.4.168.130/31	10.4.168.130 – 10.4.168.131	10.4.168.131
67	10.4.168.132/31	10.4.168.132 – 10.4.168.133	10.4.168.133
68	10.4.168.134/31	10.4.168.134 – 10.4.168.135	10.4.168.135
69	10.4.168.136/31	10.4.168.136 – 10.4.168.137	10.4.168.137
70	10.4.168.138/31	10.4.168.138 – 10.4.168.139	10.4.168.139
71	10.4.168.140/31	10.4.168.140 – 10.4.168.141	10.4.168.141
72	10.4.168.142/31	10.4.168.142 – 10.4.168.143	10.4.168.143
73	10.4.168.144/31	10.4.168.144 – 10.4.168.145	10.4.168.145
74	10.4.168.146/31	10.4.168.146 – 10.4.168.147	10.4.168.147
75	10.4.168.148/31	10.4.168.148 – 10.4.168.149	10.4.168.149
76	10.4.168.150/31	10.4.168.150 – 10.4.168.151	10.4.168.151
77	10.4.168.152/31	10.4.168.152 – 10.4.168.153	10.4.168.153
78	10.4.168.154/31	10.4.168.154 – 10.4.168.155	10.4.168.155
79	10.4.168.156/31	10.4.168.156 – 10.4.168.157	10.4.168.157
80	10.4.168.158/31	10.4.168.158 – 10.4.168.159	10.4.168.159
81	10.4.168.160/31	10.4.168.160 – 10.4.168.161	10.4.168.161
82	10.4.168.162/31	10.4.168.162 – 10.4.168.163	10.4.168.163
83	10.4.168.164/31	10.4.168.164 – 10.4.168.165	10.4.168.165
84	10.4.168.166/31	10.4.168.166 – 10.4.168.167	10.4.168.167
85	10.4.168.168/31	10.4.168.168 – 10.4.168.169	10.4.168.169
86	10.4.168.170/31	10.4.168.170 – 10.4.168.171	10.4.168.171
87	10.4.168.172/31	10.4.168.172 – 10.4.168.173	10.4.168.173
88	10.4.168.174/31	10.4.168.174 – 10.4.168.175	10.4.168.175
89	10.4.168.176/31	10.4.168.176 – 10.4.168.177	10.4.168.177
90	10.4.168.178/31	10.4.168.178 – 10.4.168.179	10.4.168.179
91	10.4.168.180/31	10.4.168.180 – 10.4.168.181	10.4.168.181
92	10.4.168.182/31	10.4.168.182 – 10.4.168.183	10.4.168.183
93	10.4.168.184/31	10.4.168.184 – 10.4.168.185	10.4.168.185
94	10.4.168.186/31	10.4.168.186 – 10.4.168.187	10.4.168.187
95	10.4.168.188/31	10.4.168.188 – 10.4.168.189	10.4.168.189
96	10.4.168.190/31	10.4.168.190 – 10.4.168.191	10.4.168.191
97	10.4.168.192/31	10.4.168.192 – 10.4.168.193	10.4.168.193
98	10.4.168.194/31	10.4.168.194 – 10.4.168.195	10.4.168.195
99	10.4.168.196/31	10.4.168.196 – 10.4.168.197	10.4.168.197
100	10.4.168.198/31	10.4.168.198 – 10.4.168.199	10.4.168.199
101	10.4.168.200/31	10.4.168.200 – 10.4.168.201	10.4.168.201
102	10.4.168.202/31	10.4.168.202 – 10.4.168.203	10.4.168.203
103	10.4.168.204/31	10.4.168.204 – 10.4.168.205	10.4.168.205
104	10.4.168.206/31	10.4.168.206 – 10.4.168.207	10.4.168.207
105	10.4.168.208/31	10.4.168.208 – 10.4.168.209	10.4.168.209
106	10.4.168.210/31	10.4.168.210 – 10.4.168.211	10.4.168.211
107	10.4.168.212/31	10.4.168.212 – 10.4.168.213	10.4.168.213
108	10.4.168.214/31	10.4.168.214 – 10.4.168.215	10.4.168.215
109	10.4.168.216/31	10.4.168.216 – 10.4.168.217	10.4.168.217
110	10.4.168.218/31	10.4.168.218 – 10.4.168.219	10.4.168.219
111	10.4.168.220/31	10.4.168.220 – 10.4.168.221	10.4.168.221
112	10.4.168.222/31	10.4.168.222 – 10.4.168.223	10.4.168.223
113	10.4.168.224/31	10.4.168.224 – 10.4.168.225	10.4.168.225
114	10.4.168.226/31	10.4.168.226 – 10.4.168.227	10.4.168.227
115	10.4.168.228/31	10.4.168.228 – 10.4.168.229	10.4.168.229
116	10.4.168.230/31	10.4.168.230 – 10.4.168.231	10.4.168.231
117	10.4.168.232/31	10.4.168.232 – 10.4.168.233	10.4.168.233
118	10.4.168.234/31	10.4.168.234 – 10.4.168.235	10.4.168.235
119	10.4.168.236/31	10.4.168.236 – 10.4.168.237	10.4.168.237
120	10.4.168.238/31	10.4.168.238 – 10.4.168.239	10.4.168.239
121	10.4.168.240/31	10.4.168.240 – 10.4.168.241	10.4.168.241
122	10.4.168.242/31	10.4.168.242 – 10.4.168.243	10.4.168.243
123	10.4.168.244/31	10.4.168.244 – 10.4.168.245	10.4.168.245
124	10.4.168.246/31	10.4.168.246 – 10.4.168.247	10.4.168.247
125	10.4.168.248/31	10.4.168.248 – 10.4.168.249	10.4.168.249
126	10.4.168.250/31	10.4.168.250 – 10.4.168.251	10.4.168.251
127	10.4.168.252/31	10.4.168.252 – 10.4.168.253	10.4.168.253
128	10.4.168.254/31	10.4.168.254 – 10.4.168.255	10.4.168.255
129	10.4.169.0/31	10.4.169.0 – 10.4.169.1	10.4.169.1
130	10.4.169.2/31	10.4.169.2 – 10.4.169.3	10.4.169.3
131	10.4.169.4/31	10.4.169.4 – 10.4.169.5	10.4.169.5
132	10.4.169.6/31	10.4.169.6 – 10.4.169.7	10.4.169.7
133	10.4.169.8/31	10.4.169.8 – 10.4.169.9	10.4.169.9
134	10.4.169.10/31	10.4.169.10 – 10.4.169.11	10.4.169.11
135	10.4.169.12/31	10.4.169.12 – 10.4.169.13	10.4.169.13
136	10.4.169.14/31	10.4.169.14 – 10.4.169.15	10.4.169.15
137	10.4.169.16/31	10.4.169.16 – 10.4.169.17	10.4.169.17
138	10.4.169.18/31	10.4.169.18 – 10.4.169.19	10.4.169.19
139	10.4.169.20/31	10.4.169.20 – 10.4.169.21	10.4.169.21
140	10.4.169.22/31	10.4.169.22 – 10.4.169.23	10.4.169.23
141	10.4.169.24/31	10.4.169.24 – 10.4.169.25	10.4.169.25
142	10.4.169.26/31	10.4.169.26 – 10.4.169.27	10.4.169.27
143	10.4.169.28/31	10.4.169.28 – 10.4.169.29	10.4.169.29
144	10.4.169.30/31	10.4.169.30 – 10.4.169.31	10.4.169.31
145	10.4.169.32/31	10.4.169.32 – 10.4.169.33	10.4.169.33
146	10.4.169.34/31	10.4.169.34 – 10.4.169.35	10.4.169.35
147	10.4.169.36/31	10.4.169.36 – 10.4.169.37	10.4.169.37
148	10.4.169.38/31	10.4.169.38 – 10.4.169.39	10.4.169.39
149	10.4.169.40/31	10.4.169.40 – 10.4.169.41	10.4.169.41
150	10.4.169.42/31	10.4.169.42 – 10.4.169.43	10.4.169.43
151	10.4.169.44/31	10.4.169.44 – 10.4.169.45	10.4.169.45
152	10.4.169.46/31	10.4.169.46 – 10.4.169.47	10.4.169.47
153	10.4.169.48/31	10.4.169.48 – 10.4.169.49	10.4.169.49
154	10.4.169.50/31	10.4.169.50 – 10.4.169.51	10.4.169.51
155	10.4.169.52/31	10.4.169.52 – 10.4.169.53	10.4.169.53
156	10.4.169.54/31	10.4.169.54 – 10.4.169.55	10.4.169.55
157	10.4.169.56/31	10.4.169.56 – 10.4.169.57	10.4.169.57
158	10.4.169.58/31	10.4.169.58 – 10.4.169.59	10.4.169.59
159	10.4.169.60/31	10.4.169.60 – 10.4.169.61	10.4.169.61
160	10.4.169.62/31	10.4.169.62 – 10.4.169.63	10.4.169.63
161	10.4.169.64/31	10.4.169.64 – 10.4.169.65	10.4.169.65
162	10.4.169.66/31	10.4.169.66 – 10.4.169.67	10.4.169.67
163	10.4.169.68/31	10.4.169.68 – 10.4.169.69	10.4.169.69
164	10.4.169.70/31	10.4.169.70 – 10.4.169.71	10.4.169.71
165	10.4.169.72/31	10.4.169.72 – 10.4.169.73	10.4.169.73
166	10.4.169.74/31	10.4.169.74 – 10.4.169.75	10.4.169.75
167	10.4.169.76/31	10.4.169.76 – 10.4.169.77	10.4.169.77
168	10.4.169.78/31	10.4.169.78 – 10.4.169.79	10.4.169.79
169	10.4.169.80/31	10.4.169.80 – 10.4.169.81	10.4.169.81
170	10.4.169.82/31	10.4.169.82 – 10.4.169.83	10.4.169.83
171	10.4.169.84/31	10.4.169.84 – 10.4.169.85	10.4.169.85
172	10.4.169.86/31	10.4.169.86 – 10.4.169.87	10.4.169.87
173	10.4.169.88/31	10.4.169.88 – 10.4.169.89	10.4.169.89
174	10.4.169.90/31	10.4.169.90 – 10.4.169.91	10.4.169.91
175	10.4.169.92/31	10.4.169.92 – 10.4.169.93	10.4.169.93
176	10.4.169.94/31	10.4.169.94 – 10.4.169.95	10.4.169.95
177	10.4.169.96/31	10.4.169.96 – 10.4.169.97	10.4.169.97
178	10.4.169.98/31	10.4.169.98 – 10.4.169.99	10.4.169.99
179	10.4.169.100/31	10.4.169.100 – 10.4.169.101	10.4.169.101
180	10.4.169.102/31	10.4.169.102 – 10.4.169.103	10.4.169.103
181	10.4.169.104/31	10.4.169.104 – 10.4.169.105	10.4.169.105
182	10.4.169.106/31	10.4.169.106 – 10.4.169.107	10.4.169.107
183	10.4.169.108/31	10.4.169.108 – 10.4.169.109	10.4.169.109
184	10.4.169.110/31	10.4.169.110 – 10.4.169.111	10.4.169.111
185	10.4.169.112/31	10.4.169.112 – 10.4.169.113	10.4.169.113
186	10.4.169.114/31	10.4.169.114 – 10.4.169.115	10.4.169.115
187	10.4.169.116/31	10.4.169.116 – 10.4.169.117	10.4.169.117
188	10.4.169.118/31	10.4.169.118 – 10.4.169.119	10.4.169.119
189	10.4.169.120/31	10.4.169.120 – 10.4.169.121	10.4.169.121
190	10.4.169.122/31	10.4.169.122 – 10.4.169.123	10.4.169.123
191	10.4.169.124/31	10.4.169.124 – 10.4.169.125	10.4.169.125
192	10.4.169.126/31	10.4.169.126 – 10.4.169.127	10.4.169.127
193	10.4.169.128/31	10.4.169.128 – 10.4.169.129	10.4.169.129
194	10.4.169.130/31	10.4.169.130 – 10.4.169.131	10.4.169.131
195	10.4.169.132/31	10.4.169.132 – 10.4.169.133	10.4.169.133
196	10.4.169.134/31	10.4.169.134 – 10.4.169.135	10.4.169.135
197	10.4.169.136/31	10.4.169.136 – 10.4.169.137	10.4.169.137
198	10.4.169.138/31	10.4.169.138 – 10.4.169.139	10.4.169.139
199	10.4.169.140/31	10.4.169.140 – 10.4.169.141	10.4.169.141
200	10.4.169.142/31	10.4.169.142 – 10.4.169.143	10.4.169.143
201	10.4.169.144/31	10.4.169.144 – 10.4.169.145	10.4.169.145
202	10.4.169.146/31	10.4.169.146 – 10.4.169.147	10.4.169.147
203	10.4.169.148/31	10.4.169.148 – 10.4.169.149	10.4.169.149
204	10.4.169.150/31	10.4.169.150 – 10.4.169.151	10.4.169.151
205	10.4.169.152/31	10.4.169.152 – 10.4.169.153	10.4.169.153
206	10.4.169.154/31	10.4.169.154 – 10.4.169.155	10.4.169.155
207	10.4.169.156/31	10.4.169.156 – 10.4.169.157	10.4.169.157
208	10.4.169.158/31	10.4.169.158 – 10.4.169.159	10.4.169.159
209	10.4.169.160/31	10.4.169.160 – 10.4.169.161	10.4.169.161
210	10.4.169.162/31	10.4.169.162 – 10.4.169.163	10.4.169.163
211	10.4.169.164/31	10.4.169.164 – 10.4.169.165	10.4.169.165
212	10.4.169.166/31	10.4.169.166 – 10.4.169.167	10.4.169.167
213	10.4.169.168/31	10.4.169.168 – 10.4.169.169	10.4.169.169
214	10.4.169.170/31	10.4.169.170 – 10.4.169.171	10.4.169.171
215	10.4.169.172/31	10.4.169.172 – 10.4.169.173	10.4.169.173
216	10.4.169.174/31	10.4.169.174 – 10.4.169.175	10.4.169.175
217	10.4.169.176/31	10.4.169.176 – 10.4.169.177	10.4.169.177
218	10.4.169.178/31	10.4.169.178 – 10.4.169.179	10.4.169.179
219	10.4.169.180/31	10.4.169.180 – 10.4.169.181	10.4.169.181
220	10.4.169.182/31	10.4.169.182 – 10.4.169.183	10.4.169.183
221	10.4.169.184/31	10.4.169.184 – 10.4.169.185	10.4.169.185
222	10.4.169.186/31	10.4.169.186 – 10.4.169.187	10.4.169.187
223	10.4.169.188/31	10.4.169.188 – 10.4.169.189	10.4.169.189
224	10.4.169.190/31	10.4.169.190 – 10.4.169.191	10.4.169.191
225	10.4.169.192/31	10.4.169.192 – 10.4.169.193	10.4.169.193
226	10.4.169.194/31	10.4.169.194 – 10.4.169.195	10.4.169.195
227	10.4.169.196/31	10.4.169.196 – 10.4.169.197	10.4.169.197
228	10.4.169.198/31	10.4.169.198 – 10.4.169.199	10.4.169.199
229	10.4.169.200/31	10.4.169.200 – 10.4.169.201	10.4.169.201
230	10.4.169.202/31	10.4.169.202 – 10.4.169.203	10.4.169.203
231	10.4.169.204/31	10.4.169.204 – 10.4.169.205	10.4.169.205
232	10.4.169.206/31	10.4.169.206 – 10.4.169.207	10.4.169.207
233	10.4.169.208/31	10.4.169.208 – 10.4.169.209	10.4.169.209
234	10.4.169.210/31	10.4.169.210 – 10.4.169.211	10.4.169.211
235	10.4.169.212/31	10.4.169.212 – 10.4.169.213	10.4.169.213
236	10.4.169.214/31	10.4.169.214 – 10.4.169.215	10.4.169.215
237	10.4.169.216/31	10.4.169.216 – 10.4.169.217	10.4.169.217
238	10.4.169.218/31	10.4.169.218 – 10.4.169.219	10.4.169.219
239	10.4.169.220/31	10.4.169.220 – 10.4.169.221	10.4.169.221
240	10.4.169.222/31	10.4.169.222 – 10.4.169.223	10.4.169.223
241	10.4.169.224/31	10.4.169.224 – 10.4.169.225	10.4.169.225
242	10.4.169.226/31	10.4.169.226 – 10.4.169.227	10.4.169.227
243	10.4.169.228/31	10.4.169.228 – 10.4.169.229	10.4.169.229
244	10.4.169.230/31	10.4.169.230 – 10.4.169.231	10.4.169.231
245	10.4.169.232/31	10.4.169.232 – 10.4.169.233	10.4.169.233
246	10.4.169.234/31	10.4.169.234 – 10.4.169.235	10.4.169.235
247	10.4.169.236/31	10.4.169.236 – 10.4.169.237	10.4.169.237
248	10.4.169.238/31	10.4.169.238 – 10.4.169.239	10.4.169.239
249	10.4.169.240/31	10.4.169.240 – 10.4.169.241	10.4.169.241
250	10.4.169.242/31	10.4.169.242 – 10.4.169.243	10.4.169.243
251	10.4.169.244/31	10.4.169.244 – 10.4.169.245	10.4.169.245
252	10.4.169.246/31	10.4.169.246 – 10.4.169.247	10.4.169.247
253	10.4.169.248/31	10.4.169.248 – 10.4.169.249	10.4.169.249
254	10.4.169.250/31	10.4.169.250 – 10.4.169.251	10.4.169.251
255	10.4.169.252/31	10.4.169.252 – 10.4.169.253	10.4.169.253
256	10.4.169.254/31	10.4.169.254 – 10.4.169.255	10.4.169.255

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 →