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)10.5.24.0/21

network10.5.24.0/21

broadcast10.5.31.255

first host10.5.24.1

last host10.5.31.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.24.0/21

address00001010.00000101.00011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.00011000.00000000

broadcast00001010.00000101.00011111.11111111

green = network part, grey = host part

hex0x0a051800

decimal168105984

reverse dns0.24.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:1800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.5.24.0/31	10.5.24.0 – 10.5.24.1	10.5.24.1
2	10.5.24.2/31	10.5.24.2 – 10.5.24.3	10.5.24.3
3	10.5.24.4/31	10.5.24.4 – 10.5.24.5	10.5.24.5
4	10.5.24.6/31	10.5.24.6 – 10.5.24.7	10.5.24.7
5	10.5.24.8/31	10.5.24.8 – 10.5.24.9	10.5.24.9
6	10.5.24.10/31	10.5.24.10 – 10.5.24.11	10.5.24.11
7	10.5.24.12/31	10.5.24.12 – 10.5.24.13	10.5.24.13
8	10.5.24.14/31	10.5.24.14 – 10.5.24.15	10.5.24.15
9	10.5.24.16/31	10.5.24.16 – 10.5.24.17	10.5.24.17
10	10.5.24.18/31	10.5.24.18 – 10.5.24.19	10.5.24.19
11	10.5.24.20/31	10.5.24.20 – 10.5.24.21	10.5.24.21
12	10.5.24.22/31	10.5.24.22 – 10.5.24.23	10.5.24.23
13	10.5.24.24/31	10.5.24.24 – 10.5.24.25	10.5.24.25
14	10.5.24.26/31	10.5.24.26 – 10.5.24.27	10.5.24.27
15	10.5.24.28/31	10.5.24.28 – 10.5.24.29	10.5.24.29
16	10.5.24.30/31	10.5.24.30 – 10.5.24.31	10.5.24.31
17	10.5.24.32/31	10.5.24.32 – 10.5.24.33	10.5.24.33
18	10.5.24.34/31	10.5.24.34 – 10.5.24.35	10.5.24.35
19	10.5.24.36/31	10.5.24.36 – 10.5.24.37	10.5.24.37
20	10.5.24.38/31	10.5.24.38 – 10.5.24.39	10.5.24.39
21	10.5.24.40/31	10.5.24.40 – 10.5.24.41	10.5.24.41
22	10.5.24.42/31	10.5.24.42 – 10.5.24.43	10.5.24.43
23	10.5.24.44/31	10.5.24.44 – 10.5.24.45	10.5.24.45
24	10.5.24.46/31	10.5.24.46 – 10.5.24.47	10.5.24.47
25	10.5.24.48/31	10.5.24.48 – 10.5.24.49	10.5.24.49
26	10.5.24.50/31	10.5.24.50 – 10.5.24.51	10.5.24.51
27	10.5.24.52/31	10.5.24.52 – 10.5.24.53	10.5.24.53
28	10.5.24.54/31	10.5.24.54 – 10.5.24.55	10.5.24.55
29	10.5.24.56/31	10.5.24.56 – 10.5.24.57	10.5.24.57
30	10.5.24.58/31	10.5.24.58 – 10.5.24.59	10.5.24.59
31	10.5.24.60/31	10.5.24.60 – 10.5.24.61	10.5.24.61
32	10.5.24.62/31	10.5.24.62 – 10.5.24.63	10.5.24.63
33	10.5.24.64/31	10.5.24.64 – 10.5.24.65	10.5.24.65
34	10.5.24.66/31	10.5.24.66 – 10.5.24.67	10.5.24.67
35	10.5.24.68/31	10.5.24.68 – 10.5.24.69	10.5.24.69
36	10.5.24.70/31	10.5.24.70 – 10.5.24.71	10.5.24.71
37	10.5.24.72/31	10.5.24.72 – 10.5.24.73	10.5.24.73
38	10.5.24.74/31	10.5.24.74 – 10.5.24.75	10.5.24.75
39	10.5.24.76/31	10.5.24.76 – 10.5.24.77	10.5.24.77
40	10.5.24.78/31	10.5.24.78 – 10.5.24.79	10.5.24.79
41	10.5.24.80/31	10.5.24.80 – 10.5.24.81	10.5.24.81
42	10.5.24.82/31	10.5.24.82 – 10.5.24.83	10.5.24.83
43	10.5.24.84/31	10.5.24.84 – 10.5.24.85	10.5.24.85
44	10.5.24.86/31	10.5.24.86 – 10.5.24.87	10.5.24.87
45	10.5.24.88/31	10.5.24.88 – 10.5.24.89	10.5.24.89
46	10.5.24.90/31	10.5.24.90 – 10.5.24.91	10.5.24.91
47	10.5.24.92/31	10.5.24.92 – 10.5.24.93	10.5.24.93
48	10.5.24.94/31	10.5.24.94 – 10.5.24.95	10.5.24.95
49	10.5.24.96/31	10.5.24.96 – 10.5.24.97	10.5.24.97
50	10.5.24.98/31	10.5.24.98 – 10.5.24.99	10.5.24.99
51	10.5.24.100/31	10.5.24.100 – 10.5.24.101	10.5.24.101
52	10.5.24.102/31	10.5.24.102 – 10.5.24.103	10.5.24.103
53	10.5.24.104/31	10.5.24.104 – 10.5.24.105	10.5.24.105
54	10.5.24.106/31	10.5.24.106 – 10.5.24.107	10.5.24.107
55	10.5.24.108/31	10.5.24.108 – 10.5.24.109	10.5.24.109
56	10.5.24.110/31	10.5.24.110 – 10.5.24.111	10.5.24.111
57	10.5.24.112/31	10.5.24.112 – 10.5.24.113	10.5.24.113
58	10.5.24.114/31	10.5.24.114 – 10.5.24.115	10.5.24.115
59	10.5.24.116/31	10.5.24.116 – 10.5.24.117	10.5.24.117
60	10.5.24.118/31	10.5.24.118 – 10.5.24.119	10.5.24.119
61	10.5.24.120/31	10.5.24.120 – 10.5.24.121	10.5.24.121
62	10.5.24.122/31	10.5.24.122 – 10.5.24.123	10.5.24.123
63	10.5.24.124/31	10.5.24.124 – 10.5.24.125	10.5.24.125
64	10.5.24.126/31	10.5.24.126 – 10.5.24.127	10.5.24.127
65	10.5.24.128/31	10.5.24.128 – 10.5.24.129	10.5.24.129
66	10.5.24.130/31	10.5.24.130 – 10.5.24.131	10.5.24.131
67	10.5.24.132/31	10.5.24.132 – 10.5.24.133	10.5.24.133
68	10.5.24.134/31	10.5.24.134 – 10.5.24.135	10.5.24.135
69	10.5.24.136/31	10.5.24.136 – 10.5.24.137	10.5.24.137
70	10.5.24.138/31	10.5.24.138 – 10.5.24.139	10.5.24.139
71	10.5.24.140/31	10.5.24.140 – 10.5.24.141	10.5.24.141
72	10.5.24.142/31	10.5.24.142 – 10.5.24.143	10.5.24.143
73	10.5.24.144/31	10.5.24.144 – 10.5.24.145	10.5.24.145
74	10.5.24.146/31	10.5.24.146 – 10.5.24.147	10.5.24.147
75	10.5.24.148/31	10.5.24.148 – 10.5.24.149	10.5.24.149
76	10.5.24.150/31	10.5.24.150 – 10.5.24.151	10.5.24.151
77	10.5.24.152/31	10.5.24.152 – 10.5.24.153	10.5.24.153
78	10.5.24.154/31	10.5.24.154 – 10.5.24.155	10.5.24.155
79	10.5.24.156/31	10.5.24.156 – 10.5.24.157	10.5.24.157
80	10.5.24.158/31	10.5.24.158 – 10.5.24.159	10.5.24.159
81	10.5.24.160/31	10.5.24.160 – 10.5.24.161	10.5.24.161
82	10.5.24.162/31	10.5.24.162 – 10.5.24.163	10.5.24.163
83	10.5.24.164/31	10.5.24.164 – 10.5.24.165	10.5.24.165
84	10.5.24.166/31	10.5.24.166 – 10.5.24.167	10.5.24.167
85	10.5.24.168/31	10.5.24.168 – 10.5.24.169	10.5.24.169
86	10.5.24.170/31	10.5.24.170 – 10.5.24.171	10.5.24.171
87	10.5.24.172/31	10.5.24.172 – 10.5.24.173	10.5.24.173
88	10.5.24.174/31	10.5.24.174 – 10.5.24.175	10.5.24.175
89	10.5.24.176/31	10.5.24.176 – 10.5.24.177	10.5.24.177
90	10.5.24.178/31	10.5.24.178 – 10.5.24.179	10.5.24.179
91	10.5.24.180/31	10.5.24.180 – 10.5.24.181	10.5.24.181
92	10.5.24.182/31	10.5.24.182 – 10.5.24.183	10.5.24.183
93	10.5.24.184/31	10.5.24.184 – 10.5.24.185	10.5.24.185
94	10.5.24.186/31	10.5.24.186 – 10.5.24.187	10.5.24.187
95	10.5.24.188/31	10.5.24.188 – 10.5.24.189	10.5.24.189
96	10.5.24.190/31	10.5.24.190 – 10.5.24.191	10.5.24.191
97	10.5.24.192/31	10.5.24.192 – 10.5.24.193	10.5.24.193
98	10.5.24.194/31	10.5.24.194 – 10.5.24.195	10.5.24.195
99	10.5.24.196/31	10.5.24.196 – 10.5.24.197	10.5.24.197
100	10.5.24.198/31	10.5.24.198 – 10.5.24.199	10.5.24.199
101	10.5.24.200/31	10.5.24.200 – 10.5.24.201	10.5.24.201
102	10.5.24.202/31	10.5.24.202 – 10.5.24.203	10.5.24.203
103	10.5.24.204/31	10.5.24.204 – 10.5.24.205	10.5.24.205
104	10.5.24.206/31	10.5.24.206 – 10.5.24.207	10.5.24.207
105	10.5.24.208/31	10.5.24.208 – 10.5.24.209	10.5.24.209
106	10.5.24.210/31	10.5.24.210 – 10.5.24.211	10.5.24.211
107	10.5.24.212/31	10.5.24.212 – 10.5.24.213	10.5.24.213
108	10.5.24.214/31	10.5.24.214 – 10.5.24.215	10.5.24.215
109	10.5.24.216/31	10.5.24.216 – 10.5.24.217	10.5.24.217
110	10.5.24.218/31	10.5.24.218 – 10.5.24.219	10.5.24.219
111	10.5.24.220/31	10.5.24.220 – 10.5.24.221	10.5.24.221
112	10.5.24.222/31	10.5.24.222 – 10.5.24.223	10.5.24.223
113	10.5.24.224/31	10.5.24.224 – 10.5.24.225	10.5.24.225
114	10.5.24.226/31	10.5.24.226 – 10.5.24.227	10.5.24.227
115	10.5.24.228/31	10.5.24.228 – 10.5.24.229	10.5.24.229
116	10.5.24.230/31	10.5.24.230 – 10.5.24.231	10.5.24.231
117	10.5.24.232/31	10.5.24.232 – 10.5.24.233	10.5.24.233
118	10.5.24.234/31	10.5.24.234 – 10.5.24.235	10.5.24.235
119	10.5.24.236/31	10.5.24.236 – 10.5.24.237	10.5.24.237
120	10.5.24.238/31	10.5.24.238 – 10.5.24.239	10.5.24.239
121	10.5.24.240/31	10.5.24.240 – 10.5.24.241	10.5.24.241
122	10.5.24.242/31	10.5.24.242 – 10.5.24.243	10.5.24.243
123	10.5.24.244/31	10.5.24.244 – 10.5.24.245	10.5.24.245
124	10.5.24.246/31	10.5.24.246 – 10.5.24.247	10.5.24.247
125	10.5.24.248/31	10.5.24.248 – 10.5.24.249	10.5.24.249
126	10.5.24.250/31	10.5.24.250 – 10.5.24.251	10.5.24.251
127	10.5.24.252/31	10.5.24.252 – 10.5.24.253	10.5.24.253
128	10.5.24.254/31	10.5.24.254 – 10.5.24.255	10.5.24.255
129	10.5.25.0/31	10.5.25.0 – 10.5.25.1	10.5.25.1
130	10.5.25.2/31	10.5.25.2 – 10.5.25.3	10.5.25.3
131	10.5.25.4/31	10.5.25.4 – 10.5.25.5	10.5.25.5
132	10.5.25.6/31	10.5.25.6 – 10.5.25.7	10.5.25.7
133	10.5.25.8/31	10.5.25.8 – 10.5.25.9	10.5.25.9
134	10.5.25.10/31	10.5.25.10 – 10.5.25.11	10.5.25.11
135	10.5.25.12/31	10.5.25.12 – 10.5.25.13	10.5.25.13
136	10.5.25.14/31	10.5.25.14 – 10.5.25.15	10.5.25.15
137	10.5.25.16/31	10.5.25.16 – 10.5.25.17	10.5.25.17
138	10.5.25.18/31	10.5.25.18 – 10.5.25.19	10.5.25.19
139	10.5.25.20/31	10.5.25.20 – 10.5.25.21	10.5.25.21
140	10.5.25.22/31	10.5.25.22 – 10.5.25.23	10.5.25.23
141	10.5.25.24/31	10.5.25.24 – 10.5.25.25	10.5.25.25
142	10.5.25.26/31	10.5.25.26 – 10.5.25.27	10.5.25.27
143	10.5.25.28/31	10.5.25.28 – 10.5.25.29	10.5.25.29
144	10.5.25.30/31	10.5.25.30 – 10.5.25.31	10.5.25.31
145	10.5.25.32/31	10.5.25.32 – 10.5.25.33	10.5.25.33
146	10.5.25.34/31	10.5.25.34 – 10.5.25.35	10.5.25.35
147	10.5.25.36/31	10.5.25.36 – 10.5.25.37	10.5.25.37
148	10.5.25.38/31	10.5.25.38 – 10.5.25.39	10.5.25.39
149	10.5.25.40/31	10.5.25.40 – 10.5.25.41	10.5.25.41
150	10.5.25.42/31	10.5.25.42 – 10.5.25.43	10.5.25.43
151	10.5.25.44/31	10.5.25.44 – 10.5.25.45	10.5.25.45
152	10.5.25.46/31	10.5.25.46 – 10.5.25.47	10.5.25.47
153	10.5.25.48/31	10.5.25.48 – 10.5.25.49	10.5.25.49
154	10.5.25.50/31	10.5.25.50 – 10.5.25.51	10.5.25.51
155	10.5.25.52/31	10.5.25.52 – 10.5.25.53	10.5.25.53
156	10.5.25.54/31	10.5.25.54 – 10.5.25.55	10.5.25.55
157	10.5.25.56/31	10.5.25.56 – 10.5.25.57	10.5.25.57
158	10.5.25.58/31	10.5.25.58 – 10.5.25.59	10.5.25.59
159	10.5.25.60/31	10.5.25.60 – 10.5.25.61	10.5.25.61
160	10.5.25.62/31	10.5.25.62 – 10.5.25.63	10.5.25.63
161	10.5.25.64/31	10.5.25.64 – 10.5.25.65	10.5.25.65
162	10.5.25.66/31	10.5.25.66 – 10.5.25.67	10.5.25.67
163	10.5.25.68/31	10.5.25.68 – 10.5.25.69	10.5.25.69
164	10.5.25.70/31	10.5.25.70 – 10.5.25.71	10.5.25.71
165	10.5.25.72/31	10.5.25.72 – 10.5.25.73	10.5.25.73
166	10.5.25.74/31	10.5.25.74 – 10.5.25.75	10.5.25.75
167	10.5.25.76/31	10.5.25.76 – 10.5.25.77	10.5.25.77
168	10.5.25.78/31	10.5.25.78 – 10.5.25.79	10.5.25.79
169	10.5.25.80/31	10.5.25.80 – 10.5.25.81	10.5.25.81
170	10.5.25.82/31	10.5.25.82 – 10.5.25.83	10.5.25.83
171	10.5.25.84/31	10.5.25.84 – 10.5.25.85	10.5.25.85
172	10.5.25.86/31	10.5.25.86 – 10.5.25.87	10.5.25.87
173	10.5.25.88/31	10.5.25.88 – 10.5.25.89	10.5.25.89
174	10.5.25.90/31	10.5.25.90 – 10.5.25.91	10.5.25.91
175	10.5.25.92/31	10.5.25.92 – 10.5.25.93	10.5.25.93
176	10.5.25.94/31	10.5.25.94 – 10.5.25.95	10.5.25.95
177	10.5.25.96/31	10.5.25.96 – 10.5.25.97	10.5.25.97
178	10.5.25.98/31	10.5.25.98 – 10.5.25.99	10.5.25.99
179	10.5.25.100/31	10.5.25.100 – 10.5.25.101	10.5.25.101
180	10.5.25.102/31	10.5.25.102 – 10.5.25.103	10.5.25.103
181	10.5.25.104/31	10.5.25.104 – 10.5.25.105	10.5.25.105
182	10.5.25.106/31	10.5.25.106 – 10.5.25.107	10.5.25.107
183	10.5.25.108/31	10.5.25.108 – 10.5.25.109	10.5.25.109
184	10.5.25.110/31	10.5.25.110 – 10.5.25.111	10.5.25.111
185	10.5.25.112/31	10.5.25.112 – 10.5.25.113	10.5.25.113
186	10.5.25.114/31	10.5.25.114 – 10.5.25.115	10.5.25.115
187	10.5.25.116/31	10.5.25.116 – 10.5.25.117	10.5.25.117
188	10.5.25.118/31	10.5.25.118 – 10.5.25.119	10.5.25.119
189	10.5.25.120/31	10.5.25.120 – 10.5.25.121	10.5.25.121
190	10.5.25.122/31	10.5.25.122 – 10.5.25.123	10.5.25.123
191	10.5.25.124/31	10.5.25.124 – 10.5.25.125	10.5.25.125
192	10.5.25.126/31	10.5.25.126 – 10.5.25.127	10.5.25.127
193	10.5.25.128/31	10.5.25.128 – 10.5.25.129	10.5.25.129
194	10.5.25.130/31	10.5.25.130 – 10.5.25.131	10.5.25.131
195	10.5.25.132/31	10.5.25.132 – 10.5.25.133	10.5.25.133
196	10.5.25.134/31	10.5.25.134 – 10.5.25.135	10.5.25.135
197	10.5.25.136/31	10.5.25.136 – 10.5.25.137	10.5.25.137
198	10.5.25.138/31	10.5.25.138 – 10.5.25.139	10.5.25.139
199	10.5.25.140/31	10.5.25.140 – 10.5.25.141	10.5.25.141
200	10.5.25.142/31	10.5.25.142 – 10.5.25.143	10.5.25.143
201	10.5.25.144/31	10.5.25.144 – 10.5.25.145	10.5.25.145
202	10.5.25.146/31	10.5.25.146 – 10.5.25.147	10.5.25.147
203	10.5.25.148/31	10.5.25.148 – 10.5.25.149	10.5.25.149
204	10.5.25.150/31	10.5.25.150 – 10.5.25.151	10.5.25.151
205	10.5.25.152/31	10.5.25.152 – 10.5.25.153	10.5.25.153
206	10.5.25.154/31	10.5.25.154 – 10.5.25.155	10.5.25.155
207	10.5.25.156/31	10.5.25.156 – 10.5.25.157	10.5.25.157
208	10.5.25.158/31	10.5.25.158 – 10.5.25.159	10.5.25.159
209	10.5.25.160/31	10.5.25.160 – 10.5.25.161	10.5.25.161
210	10.5.25.162/31	10.5.25.162 – 10.5.25.163	10.5.25.163
211	10.5.25.164/31	10.5.25.164 – 10.5.25.165	10.5.25.165
212	10.5.25.166/31	10.5.25.166 – 10.5.25.167	10.5.25.167
213	10.5.25.168/31	10.5.25.168 – 10.5.25.169	10.5.25.169
214	10.5.25.170/31	10.5.25.170 – 10.5.25.171	10.5.25.171
215	10.5.25.172/31	10.5.25.172 – 10.5.25.173	10.5.25.173
216	10.5.25.174/31	10.5.25.174 – 10.5.25.175	10.5.25.175
217	10.5.25.176/31	10.5.25.176 – 10.5.25.177	10.5.25.177
218	10.5.25.178/31	10.5.25.178 – 10.5.25.179	10.5.25.179
219	10.5.25.180/31	10.5.25.180 – 10.5.25.181	10.5.25.181
220	10.5.25.182/31	10.5.25.182 – 10.5.25.183	10.5.25.183
221	10.5.25.184/31	10.5.25.184 – 10.5.25.185	10.5.25.185
222	10.5.25.186/31	10.5.25.186 – 10.5.25.187	10.5.25.187
223	10.5.25.188/31	10.5.25.188 – 10.5.25.189	10.5.25.189
224	10.5.25.190/31	10.5.25.190 – 10.5.25.191	10.5.25.191
225	10.5.25.192/31	10.5.25.192 – 10.5.25.193	10.5.25.193
226	10.5.25.194/31	10.5.25.194 – 10.5.25.195	10.5.25.195
227	10.5.25.196/31	10.5.25.196 – 10.5.25.197	10.5.25.197
228	10.5.25.198/31	10.5.25.198 – 10.5.25.199	10.5.25.199
229	10.5.25.200/31	10.5.25.200 – 10.5.25.201	10.5.25.201
230	10.5.25.202/31	10.5.25.202 – 10.5.25.203	10.5.25.203
231	10.5.25.204/31	10.5.25.204 – 10.5.25.205	10.5.25.205
232	10.5.25.206/31	10.5.25.206 – 10.5.25.207	10.5.25.207
233	10.5.25.208/31	10.5.25.208 – 10.5.25.209	10.5.25.209
234	10.5.25.210/31	10.5.25.210 – 10.5.25.211	10.5.25.211
235	10.5.25.212/31	10.5.25.212 – 10.5.25.213	10.5.25.213
236	10.5.25.214/31	10.5.25.214 – 10.5.25.215	10.5.25.215
237	10.5.25.216/31	10.5.25.216 – 10.5.25.217	10.5.25.217
238	10.5.25.218/31	10.5.25.218 – 10.5.25.219	10.5.25.219
239	10.5.25.220/31	10.5.25.220 – 10.5.25.221	10.5.25.221
240	10.5.25.222/31	10.5.25.222 – 10.5.25.223	10.5.25.223
241	10.5.25.224/31	10.5.25.224 – 10.5.25.225	10.5.25.225
242	10.5.25.226/31	10.5.25.226 – 10.5.25.227	10.5.25.227
243	10.5.25.228/31	10.5.25.228 – 10.5.25.229	10.5.25.229
244	10.5.25.230/31	10.5.25.230 – 10.5.25.231	10.5.25.231
245	10.5.25.232/31	10.5.25.232 – 10.5.25.233	10.5.25.233
246	10.5.25.234/31	10.5.25.234 – 10.5.25.235	10.5.25.235
247	10.5.25.236/31	10.5.25.236 – 10.5.25.237	10.5.25.237
248	10.5.25.238/31	10.5.25.238 – 10.5.25.239	10.5.25.239
249	10.5.25.240/31	10.5.25.240 – 10.5.25.241	10.5.25.241
250	10.5.25.242/31	10.5.25.242 – 10.5.25.243	10.5.25.243
251	10.5.25.244/31	10.5.25.244 – 10.5.25.245	10.5.25.245
252	10.5.25.246/31	10.5.25.246 – 10.5.25.247	10.5.25.247
253	10.5.25.248/31	10.5.25.248 – 10.5.25.249	10.5.25.249
254	10.5.25.250/31	10.5.25.250 – 10.5.25.251	10.5.25.251
255	10.5.25.252/31	10.5.25.252 – 10.5.25.253	10.5.25.253
256	10.5.25.254/31	10.5.25.254 – 10.5.25.255	10.5.25.255

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 →