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)10.4.224.0/21

network10.4.224.0/21

broadcast10.4.231.255

first host10.4.224.1

last host10.4.231.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.224.0/21

address00001010.00000100.11100000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.11100000.00000000

broadcast00001010.00000100.11100111.11111111

green = network part, grey = host part

hex0x0a04e000

decimal168091648

reverse dns0.224.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:e000

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.4.224.0/31	10.4.224.0 – 10.4.224.1	10.4.224.1
2	10.4.224.2/31	10.4.224.2 – 10.4.224.3	10.4.224.3
3	10.4.224.4/31	10.4.224.4 – 10.4.224.5	10.4.224.5
4	10.4.224.6/31	10.4.224.6 – 10.4.224.7	10.4.224.7
5	10.4.224.8/31	10.4.224.8 – 10.4.224.9	10.4.224.9
6	10.4.224.10/31	10.4.224.10 – 10.4.224.11	10.4.224.11
7	10.4.224.12/31	10.4.224.12 – 10.4.224.13	10.4.224.13
8	10.4.224.14/31	10.4.224.14 – 10.4.224.15	10.4.224.15
9	10.4.224.16/31	10.4.224.16 – 10.4.224.17	10.4.224.17
10	10.4.224.18/31	10.4.224.18 – 10.4.224.19	10.4.224.19
11	10.4.224.20/31	10.4.224.20 – 10.4.224.21	10.4.224.21
12	10.4.224.22/31	10.4.224.22 – 10.4.224.23	10.4.224.23
13	10.4.224.24/31	10.4.224.24 – 10.4.224.25	10.4.224.25
14	10.4.224.26/31	10.4.224.26 – 10.4.224.27	10.4.224.27
15	10.4.224.28/31	10.4.224.28 – 10.4.224.29	10.4.224.29
16	10.4.224.30/31	10.4.224.30 – 10.4.224.31	10.4.224.31
17	10.4.224.32/31	10.4.224.32 – 10.4.224.33	10.4.224.33
18	10.4.224.34/31	10.4.224.34 – 10.4.224.35	10.4.224.35
19	10.4.224.36/31	10.4.224.36 – 10.4.224.37	10.4.224.37
20	10.4.224.38/31	10.4.224.38 – 10.4.224.39	10.4.224.39
21	10.4.224.40/31	10.4.224.40 – 10.4.224.41	10.4.224.41
22	10.4.224.42/31	10.4.224.42 – 10.4.224.43	10.4.224.43
23	10.4.224.44/31	10.4.224.44 – 10.4.224.45	10.4.224.45
24	10.4.224.46/31	10.4.224.46 – 10.4.224.47	10.4.224.47
25	10.4.224.48/31	10.4.224.48 – 10.4.224.49	10.4.224.49
26	10.4.224.50/31	10.4.224.50 – 10.4.224.51	10.4.224.51
27	10.4.224.52/31	10.4.224.52 – 10.4.224.53	10.4.224.53
28	10.4.224.54/31	10.4.224.54 – 10.4.224.55	10.4.224.55
29	10.4.224.56/31	10.4.224.56 – 10.4.224.57	10.4.224.57
30	10.4.224.58/31	10.4.224.58 – 10.4.224.59	10.4.224.59
31	10.4.224.60/31	10.4.224.60 – 10.4.224.61	10.4.224.61
32	10.4.224.62/31	10.4.224.62 – 10.4.224.63	10.4.224.63
33	10.4.224.64/31	10.4.224.64 – 10.4.224.65	10.4.224.65
34	10.4.224.66/31	10.4.224.66 – 10.4.224.67	10.4.224.67
35	10.4.224.68/31	10.4.224.68 – 10.4.224.69	10.4.224.69
36	10.4.224.70/31	10.4.224.70 – 10.4.224.71	10.4.224.71
37	10.4.224.72/31	10.4.224.72 – 10.4.224.73	10.4.224.73
38	10.4.224.74/31	10.4.224.74 – 10.4.224.75	10.4.224.75
39	10.4.224.76/31	10.4.224.76 – 10.4.224.77	10.4.224.77
40	10.4.224.78/31	10.4.224.78 – 10.4.224.79	10.4.224.79
41	10.4.224.80/31	10.4.224.80 – 10.4.224.81	10.4.224.81
42	10.4.224.82/31	10.4.224.82 – 10.4.224.83	10.4.224.83
43	10.4.224.84/31	10.4.224.84 – 10.4.224.85	10.4.224.85
44	10.4.224.86/31	10.4.224.86 – 10.4.224.87	10.4.224.87
45	10.4.224.88/31	10.4.224.88 – 10.4.224.89	10.4.224.89
46	10.4.224.90/31	10.4.224.90 – 10.4.224.91	10.4.224.91
47	10.4.224.92/31	10.4.224.92 – 10.4.224.93	10.4.224.93
48	10.4.224.94/31	10.4.224.94 – 10.4.224.95	10.4.224.95
49	10.4.224.96/31	10.4.224.96 – 10.4.224.97	10.4.224.97
50	10.4.224.98/31	10.4.224.98 – 10.4.224.99	10.4.224.99
51	10.4.224.100/31	10.4.224.100 – 10.4.224.101	10.4.224.101
52	10.4.224.102/31	10.4.224.102 – 10.4.224.103	10.4.224.103
53	10.4.224.104/31	10.4.224.104 – 10.4.224.105	10.4.224.105
54	10.4.224.106/31	10.4.224.106 – 10.4.224.107	10.4.224.107
55	10.4.224.108/31	10.4.224.108 – 10.4.224.109	10.4.224.109
56	10.4.224.110/31	10.4.224.110 – 10.4.224.111	10.4.224.111
57	10.4.224.112/31	10.4.224.112 – 10.4.224.113	10.4.224.113
58	10.4.224.114/31	10.4.224.114 – 10.4.224.115	10.4.224.115
59	10.4.224.116/31	10.4.224.116 – 10.4.224.117	10.4.224.117
60	10.4.224.118/31	10.4.224.118 – 10.4.224.119	10.4.224.119
61	10.4.224.120/31	10.4.224.120 – 10.4.224.121	10.4.224.121
62	10.4.224.122/31	10.4.224.122 – 10.4.224.123	10.4.224.123
63	10.4.224.124/31	10.4.224.124 – 10.4.224.125	10.4.224.125
64	10.4.224.126/31	10.4.224.126 – 10.4.224.127	10.4.224.127
65	10.4.224.128/31	10.4.224.128 – 10.4.224.129	10.4.224.129
66	10.4.224.130/31	10.4.224.130 – 10.4.224.131	10.4.224.131
67	10.4.224.132/31	10.4.224.132 – 10.4.224.133	10.4.224.133
68	10.4.224.134/31	10.4.224.134 – 10.4.224.135	10.4.224.135
69	10.4.224.136/31	10.4.224.136 – 10.4.224.137	10.4.224.137
70	10.4.224.138/31	10.4.224.138 – 10.4.224.139	10.4.224.139
71	10.4.224.140/31	10.4.224.140 – 10.4.224.141	10.4.224.141
72	10.4.224.142/31	10.4.224.142 – 10.4.224.143	10.4.224.143
73	10.4.224.144/31	10.4.224.144 – 10.4.224.145	10.4.224.145
74	10.4.224.146/31	10.4.224.146 – 10.4.224.147	10.4.224.147
75	10.4.224.148/31	10.4.224.148 – 10.4.224.149	10.4.224.149
76	10.4.224.150/31	10.4.224.150 – 10.4.224.151	10.4.224.151
77	10.4.224.152/31	10.4.224.152 – 10.4.224.153	10.4.224.153
78	10.4.224.154/31	10.4.224.154 – 10.4.224.155	10.4.224.155
79	10.4.224.156/31	10.4.224.156 – 10.4.224.157	10.4.224.157
80	10.4.224.158/31	10.4.224.158 – 10.4.224.159	10.4.224.159
81	10.4.224.160/31	10.4.224.160 – 10.4.224.161	10.4.224.161
82	10.4.224.162/31	10.4.224.162 – 10.4.224.163	10.4.224.163
83	10.4.224.164/31	10.4.224.164 – 10.4.224.165	10.4.224.165
84	10.4.224.166/31	10.4.224.166 – 10.4.224.167	10.4.224.167
85	10.4.224.168/31	10.4.224.168 – 10.4.224.169	10.4.224.169
86	10.4.224.170/31	10.4.224.170 – 10.4.224.171	10.4.224.171
87	10.4.224.172/31	10.4.224.172 – 10.4.224.173	10.4.224.173
88	10.4.224.174/31	10.4.224.174 – 10.4.224.175	10.4.224.175
89	10.4.224.176/31	10.4.224.176 – 10.4.224.177	10.4.224.177
90	10.4.224.178/31	10.4.224.178 – 10.4.224.179	10.4.224.179
91	10.4.224.180/31	10.4.224.180 – 10.4.224.181	10.4.224.181
92	10.4.224.182/31	10.4.224.182 – 10.4.224.183	10.4.224.183
93	10.4.224.184/31	10.4.224.184 – 10.4.224.185	10.4.224.185
94	10.4.224.186/31	10.4.224.186 – 10.4.224.187	10.4.224.187
95	10.4.224.188/31	10.4.224.188 – 10.4.224.189	10.4.224.189
96	10.4.224.190/31	10.4.224.190 – 10.4.224.191	10.4.224.191
97	10.4.224.192/31	10.4.224.192 – 10.4.224.193	10.4.224.193
98	10.4.224.194/31	10.4.224.194 – 10.4.224.195	10.4.224.195
99	10.4.224.196/31	10.4.224.196 – 10.4.224.197	10.4.224.197
100	10.4.224.198/31	10.4.224.198 – 10.4.224.199	10.4.224.199
101	10.4.224.200/31	10.4.224.200 – 10.4.224.201	10.4.224.201
102	10.4.224.202/31	10.4.224.202 – 10.4.224.203	10.4.224.203
103	10.4.224.204/31	10.4.224.204 – 10.4.224.205	10.4.224.205
104	10.4.224.206/31	10.4.224.206 – 10.4.224.207	10.4.224.207
105	10.4.224.208/31	10.4.224.208 – 10.4.224.209	10.4.224.209
106	10.4.224.210/31	10.4.224.210 – 10.4.224.211	10.4.224.211
107	10.4.224.212/31	10.4.224.212 – 10.4.224.213	10.4.224.213
108	10.4.224.214/31	10.4.224.214 – 10.4.224.215	10.4.224.215
109	10.4.224.216/31	10.4.224.216 – 10.4.224.217	10.4.224.217
110	10.4.224.218/31	10.4.224.218 – 10.4.224.219	10.4.224.219
111	10.4.224.220/31	10.4.224.220 – 10.4.224.221	10.4.224.221
112	10.4.224.222/31	10.4.224.222 – 10.4.224.223	10.4.224.223
113	10.4.224.224/31	10.4.224.224 – 10.4.224.225	10.4.224.225
114	10.4.224.226/31	10.4.224.226 – 10.4.224.227	10.4.224.227
115	10.4.224.228/31	10.4.224.228 – 10.4.224.229	10.4.224.229
116	10.4.224.230/31	10.4.224.230 – 10.4.224.231	10.4.224.231
117	10.4.224.232/31	10.4.224.232 – 10.4.224.233	10.4.224.233
118	10.4.224.234/31	10.4.224.234 – 10.4.224.235	10.4.224.235
119	10.4.224.236/31	10.4.224.236 – 10.4.224.237	10.4.224.237
120	10.4.224.238/31	10.4.224.238 – 10.4.224.239	10.4.224.239
121	10.4.224.240/31	10.4.224.240 – 10.4.224.241	10.4.224.241
122	10.4.224.242/31	10.4.224.242 – 10.4.224.243	10.4.224.243
123	10.4.224.244/31	10.4.224.244 – 10.4.224.245	10.4.224.245
124	10.4.224.246/31	10.4.224.246 – 10.4.224.247	10.4.224.247
125	10.4.224.248/31	10.4.224.248 – 10.4.224.249	10.4.224.249
126	10.4.224.250/31	10.4.224.250 – 10.4.224.251	10.4.224.251
127	10.4.224.252/31	10.4.224.252 – 10.4.224.253	10.4.224.253
128	10.4.224.254/31	10.4.224.254 – 10.4.224.255	10.4.224.255
129	10.4.225.0/31	10.4.225.0 – 10.4.225.1	10.4.225.1
130	10.4.225.2/31	10.4.225.2 – 10.4.225.3	10.4.225.3
131	10.4.225.4/31	10.4.225.4 – 10.4.225.5	10.4.225.5
132	10.4.225.6/31	10.4.225.6 – 10.4.225.7	10.4.225.7
133	10.4.225.8/31	10.4.225.8 – 10.4.225.9	10.4.225.9
134	10.4.225.10/31	10.4.225.10 – 10.4.225.11	10.4.225.11
135	10.4.225.12/31	10.4.225.12 – 10.4.225.13	10.4.225.13
136	10.4.225.14/31	10.4.225.14 – 10.4.225.15	10.4.225.15
137	10.4.225.16/31	10.4.225.16 – 10.4.225.17	10.4.225.17
138	10.4.225.18/31	10.4.225.18 – 10.4.225.19	10.4.225.19
139	10.4.225.20/31	10.4.225.20 – 10.4.225.21	10.4.225.21
140	10.4.225.22/31	10.4.225.22 – 10.4.225.23	10.4.225.23
141	10.4.225.24/31	10.4.225.24 – 10.4.225.25	10.4.225.25
142	10.4.225.26/31	10.4.225.26 – 10.4.225.27	10.4.225.27
143	10.4.225.28/31	10.4.225.28 – 10.4.225.29	10.4.225.29
144	10.4.225.30/31	10.4.225.30 – 10.4.225.31	10.4.225.31
145	10.4.225.32/31	10.4.225.32 – 10.4.225.33	10.4.225.33
146	10.4.225.34/31	10.4.225.34 – 10.4.225.35	10.4.225.35
147	10.4.225.36/31	10.4.225.36 – 10.4.225.37	10.4.225.37
148	10.4.225.38/31	10.4.225.38 – 10.4.225.39	10.4.225.39
149	10.4.225.40/31	10.4.225.40 – 10.4.225.41	10.4.225.41
150	10.4.225.42/31	10.4.225.42 – 10.4.225.43	10.4.225.43
151	10.4.225.44/31	10.4.225.44 – 10.4.225.45	10.4.225.45
152	10.4.225.46/31	10.4.225.46 – 10.4.225.47	10.4.225.47
153	10.4.225.48/31	10.4.225.48 – 10.4.225.49	10.4.225.49
154	10.4.225.50/31	10.4.225.50 – 10.4.225.51	10.4.225.51
155	10.4.225.52/31	10.4.225.52 – 10.4.225.53	10.4.225.53
156	10.4.225.54/31	10.4.225.54 – 10.4.225.55	10.4.225.55
157	10.4.225.56/31	10.4.225.56 – 10.4.225.57	10.4.225.57
158	10.4.225.58/31	10.4.225.58 – 10.4.225.59	10.4.225.59
159	10.4.225.60/31	10.4.225.60 – 10.4.225.61	10.4.225.61
160	10.4.225.62/31	10.4.225.62 – 10.4.225.63	10.4.225.63
161	10.4.225.64/31	10.4.225.64 – 10.4.225.65	10.4.225.65
162	10.4.225.66/31	10.4.225.66 – 10.4.225.67	10.4.225.67
163	10.4.225.68/31	10.4.225.68 – 10.4.225.69	10.4.225.69
164	10.4.225.70/31	10.4.225.70 – 10.4.225.71	10.4.225.71
165	10.4.225.72/31	10.4.225.72 – 10.4.225.73	10.4.225.73
166	10.4.225.74/31	10.4.225.74 – 10.4.225.75	10.4.225.75
167	10.4.225.76/31	10.4.225.76 – 10.4.225.77	10.4.225.77
168	10.4.225.78/31	10.4.225.78 – 10.4.225.79	10.4.225.79
169	10.4.225.80/31	10.4.225.80 – 10.4.225.81	10.4.225.81
170	10.4.225.82/31	10.4.225.82 – 10.4.225.83	10.4.225.83
171	10.4.225.84/31	10.4.225.84 – 10.4.225.85	10.4.225.85
172	10.4.225.86/31	10.4.225.86 – 10.4.225.87	10.4.225.87
173	10.4.225.88/31	10.4.225.88 – 10.4.225.89	10.4.225.89
174	10.4.225.90/31	10.4.225.90 – 10.4.225.91	10.4.225.91
175	10.4.225.92/31	10.4.225.92 – 10.4.225.93	10.4.225.93
176	10.4.225.94/31	10.4.225.94 – 10.4.225.95	10.4.225.95
177	10.4.225.96/31	10.4.225.96 – 10.4.225.97	10.4.225.97
178	10.4.225.98/31	10.4.225.98 – 10.4.225.99	10.4.225.99
179	10.4.225.100/31	10.4.225.100 – 10.4.225.101	10.4.225.101
180	10.4.225.102/31	10.4.225.102 – 10.4.225.103	10.4.225.103
181	10.4.225.104/31	10.4.225.104 – 10.4.225.105	10.4.225.105
182	10.4.225.106/31	10.4.225.106 – 10.4.225.107	10.4.225.107
183	10.4.225.108/31	10.4.225.108 – 10.4.225.109	10.4.225.109
184	10.4.225.110/31	10.4.225.110 – 10.4.225.111	10.4.225.111
185	10.4.225.112/31	10.4.225.112 – 10.4.225.113	10.4.225.113
186	10.4.225.114/31	10.4.225.114 – 10.4.225.115	10.4.225.115
187	10.4.225.116/31	10.4.225.116 – 10.4.225.117	10.4.225.117
188	10.4.225.118/31	10.4.225.118 – 10.4.225.119	10.4.225.119
189	10.4.225.120/31	10.4.225.120 – 10.4.225.121	10.4.225.121
190	10.4.225.122/31	10.4.225.122 – 10.4.225.123	10.4.225.123
191	10.4.225.124/31	10.4.225.124 – 10.4.225.125	10.4.225.125
192	10.4.225.126/31	10.4.225.126 – 10.4.225.127	10.4.225.127
193	10.4.225.128/31	10.4.225.128 – 10.4.225.129	10.4.225.129
194	10.4.225.130/31	10.4.225.130 – 10.4.225.131	10.4.225.131
195	10.4.225.132/31	10.4.225.132 – 10.4.225.133	10.4.225.133
196	10.4.225.134/31	10.4.225.134 – 10.4.225.135	10.4.225.135
197	10.4.225.136/31	10.4.225.136 – 10.4.225.137	10.4.225.137
198	10.4.225.138/31	10.4.225.138 – 10.4.225.139	10.4.225.139
199	10.4.225.140/31	10.4.225.140 – 10.4.225.141	10.4.225.141
200	10.4.225.142/31	10.4.225.142 – 10.4.225.143	10.4.225.143
201	10.4.225.144/31	10.4.225.144 – 10.4.225.145	10.4.225.145
202	10.4.225.146/31	10.4.225.146 – 10.4.225.147	10.4.225.147
203	10.4.225.148/31	10.4.225.148 – 10.4.225.149	10.4.225.149
204	10.4.225.150/31	10.4.225.150 – 10.4.225.151	10.4.225.151
205	10.4.225.152/31	10.4.225.152 – 10.4.225.153	10.4.225.153
206	10.4.225.154/31	10.4.225.154 – 10.4.225.155	10.4.225.155
207	10.4.225.156/31	10.4.225.156 – 10.4.225.157	10.4.225.157
208	10.4.225.158/31	10.4.225.158 – 10.4.225.159	10.4.225.159
209	10.4.225.160/31	10.4.225.160 – 10.4.225.161	10.4.225.161
210	10.4.225.162/31	10.4.225.162 – 10.4.225.163	10.4.225.163
211	10.4.225.164/31	10.4.225.164 – 10.4.225.165	10.4.225.165
212	10.4.225.166/31	10.4.225.166 – 10.4.225.167	10.4.225.167
213	10.4.225.168/31	10.4.225.168 – 10.4.225.169	10.4.225.169
214	10.4.225.170/31	10.4.225.170 – 10.4.225.171	10.4.225.171
215	10.4.225.172/31	10.4.225.172 – 10.4.225.173	10.4.225.173
216	10.4.225.174/31	10.4.225.174 – 10.4.225.175	10.4.225.175
217	10.4.225.176/31	10.4.225.176 – 10.4.225.177	10.4.225.177
218	10.4.225.178/31	10.4.225.178 – 10.4.225.179	10.4.225.179
219	10.4.225.180/31	10.4.225.180 – 10.4.225.181	10.4.225.181
220	10.4.225.182/31	10.4.225.182 – 10.4.225.183	10.4.225.183
221	10.4.225.184/31	10.4.225.184 – 10.4.225.185	10.4.225.185
222	10.4.225.186/31	10.4.225.186 – 10.4.225.187	10.4.225.187
223	10.4.225.188/31	10.4.225.188 – 10.4.225.189	10.4.225.189
224	10.4.225.190/31	10.4.225.190 – 10.4.225.191	10.4.225.191
225	10.4.225.192/31	10.4.225.192 – 10.4.225.193	10.4.225.193
226	10.4.225.194/31	10.4.225.194 – 10.4.225.195	10.4.225.195
227	10.4.225.196/31	10.4.225.196 – 10.4.225.197	10.4.225.197
228	10.4.225.198/31	10.4.225.198 – 10.4.225.199	10.4.225.199
229	10.4.225.200/31	10.4.225.200 – 10.4.225.201	10.4.225.201
230	10.4.225.202/31	10.4.225.202 – 10.4.225.203	10.4.225.203
231	10.4.225.204/31	10.4.225.204 – 10.4.225.205	10.4.225.205
232	10.4.225.206/31	10.4.225.206 – 10.4.225.207	10.4.225.207
233	10.4.225.208/31	10.4.225.208 – 10.4.225.209	10.4.225.209
234	10.4.225.210/31	10.4.225.210 – 10.4.225.211	10.4.225.211
235	10.4.225.212/31	10.4.225.212 – 10.4.225.213	10.4.225.213
236	10.4.225.214/31	10.4.225.214 – 10.4.225.215	10.4.225.215
237	10.4.225.216/31	10.4.225.216 – 10.4.225.217	10.4.225.217
238	10.4.225.218/31	10.4.225.218 – 10.4.225.219	10.4.225.219
239	10.4.225.220/31	10.4.225.220 – 10.4.225.221	10.4.225.221
240	10.4.225.222/31	10.4.225.222 – 10.4.225.223	10.4.225.223
241	10.4.225.224/31	10.4.225.224 – 10.4.225.225	10.4.225.225
242	10.4.225.226/31	10.4.225.226 – 10.4.225.227	10.4.225.227
243	10.4.225.228/31	10.4.225.228 – 10.4.225.229	10.4.225.229
244	10.4.225.230/31	10.4.225.230 – 10.4.225.231	10.4.225.231
245	10.4.225.232/31	10.4.225.232 – 10.4.225.233	10.4.225.233
246	10.4.225.234/31	10.4.225.234 – 10.4.225.235	10.4.225.235
247	10.4.225.236/31	10.4.225.236 – 10.4.225.237	10.4.225.237
248	10.4.225.238/31	10.4.225.238 – 10.4.225.239	10.4.225.239
249	10.4.225.240/31	10.4.225.240 – 10.4.225.241	10.4.225.241
250	10.4.225.242/31	10.4.225.242 – 10.4.225.243	10.4.225.243
251	10.4.225.244/31	10.4.225.244 – 10.4.225.245	10.4.225.245
252	10.4.225.246/31	10.4.225.246 – 10.4.225.247	10.4.225.247
253	10.4.225.248/31	10.4.225.248 – 10.4.225.249	10.4.225.249
254	10.4.225.250/31	10.4.225.250 – 10.4.225.251	10.4.225.251
255	10.4.225.252/31	10.4.225.252 – 10.4.225.253	10.4.225.253
256	10.4.225.254/31	10.4.225.254 – 10.4.225.255	10.4.225.255

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 →