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)10.2.136.0/21

network10.2.136.0/21

broadcast10.2.143.255

first host10.2.136.1

last host10.2.143.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.136.0/21

address00001010.00000010.10001000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.10001000.00000000

broadcast00001010.00000010.10001111.11111111

green = network part, grey = host part

hex0x0a028800

decimal167938048

reverse dns0.136.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.2.136.0/31	10.2.136.0 – 10.2.136.1	10.2.136.1
2	10.2.136.2/31	10.2.136.2 – 10.2.136.3	10.2.136.3
3	10.2.136.4/31	10.2.136.4 – 10.2.136.5	10.2.136.5
4	10.2.136.6/31	10.2.136.6 – 10.2.136.7	10.2.136.7
5	10.2.136.8/31	10.2.136.8 – 10.2.136.9	10.2.136.9
6	10.2.136.10/31	10.2.136.10 – 10.2.136.11	10.2.136.11
7	10.2.136.12/31	10.2.136.12 – 10.2.136.13	10.2.136.13
8	10.2.136.14/31	10.2.136.14 – 10.2.136.15	10.2.136.15
9	10.2.136.16/31	10.2.136.16 – 10.2.136.17	10.2.136.17
10	10.2.136.18/31	10.2.136.18 – 10.2.136.19	10.2.136.19
11	10.2.136.20/31	10.2.136.20 – 10.2.136.21	10.2.136.21
12	10.2.136.22/31	10.2.136.22 – 10.2.136.23	10.2.136.23
13	10.2.136.24/31	10.2.136.24 – 10.2.136.25	10.2.136.25
14	10.2.136.26/31	10.2.136.26 – 10.2.136.27	10.2.136.27
15	10.2.136.28/31	10.2.136.28 – 10.2.136.29	10.2.136.29
16	10.2.136.30/31	10.2.136.30 – 10.2.136.31	10.2.136.31
17	10.2.136.32/31	10.2.136.32 – 10.2.136.33	10.2.136.33
18	10.2.136.34/31	10.2.136.34 – 10.2.136.35	10.2.136.35
19	10.2.136.36/31	10.2.136.36 – 10.2.136.37	10.2.136.37
20	10.2.136.38/31	10.2.136.38 – 10.2.136.39	10.2.136.39
21	10.2.136.40/31	10.2.136.40 – 10.2.136.41	10.2.136.41
22	10.2.136.42/31	10.2.136.42 – 10.2.136.43	10.2.136.43
23	10.2.136.44/31	10.2.136.44 – 10.2.136.45	10.2.136.45
24	10.2.136.46/31	10.2.136.46 – 10.2.136.47	10.2.136.47
25	10.2.136.48/31	10.2.136.48 – 10.2.136.49	10.2.136.49
26	10.2.136.50/31	10.2.136.50 – 10.2.136.51	10.2.136.51
27	10.2.136.52/31	10.2.136.52 – 10.2.136.53	10.2.136.53
28	10.2.136.54/31	10.2.136.54 – 10.2.136.55	10.2.136.55
29	10.2.136.56/31	10.2.136.56 – 10.2.136.57	10.2.136.57
30	10.2.136.58/31	10.2.136.58 – 10.2.136.59	10.2.136.59
31	10.2.136.60/31	10.2.136.60 – 10.2.136.61	10.2.136.61
32	10.2.136.62/31	10.2.136.62 – 10.2.136.63	10.2.136.63
33	10.2.136.64/31	10.2.136.64 – 10.2.136.65	10.2.136.65
34	10.2.136.66/31	10.2.136.66 – 10.2.136.67	10.2.136.67
35	10.2.136.68/31	10.2.136.68 – 10.2.136.69	10.2.136.69
36	10.2.136.70/31	10.2.136.70 – 10.2.136.71	10.2.136.71
37	10.2.136.72/31	10.2.136.72 – 10.2.136.73	10.2.136.73
38	10.2.136.74/31	10.2.136.74 – 10.2.136.75	10.2.136.75
39	10.2.136.76/31	10.2.136.76 – 10.2.136.77	10.2.136.77
40	10.2.136.78/31	10.2.136.78 – 10.2.136.79	10.2.136.79
41	10.2.136.80/31	10.2.136.80 – 10.2.136.81	10.2.136.81
42	10.2.136.82/31	10.2.136.82 – 10.2.136.83	10.2.136.83
43	10.2.136.84/31	10.2.136.84 – 10.2.136.85	10.2.136.85
44	10.2.136.86/31	10.2.136.86 – 10.2.136.87	10.2.136.87
45	10.2.136.88/31	10.2.136.88 – 10.2.136.89	10.2.136.89
46	10.2.136.90/31	10.2.136.90 – 10.2.136.91	10.2.136.91
47	10.2.136.92/31	10.2.136.92 – 10.2.136.93	10.2.136.93
48	10.2.136.94/31	10.2.136.94 – 10.2.136.95	10.2.136.95
49	10.2.136.96/31	10.2.136.96 – 10.2.136.97	10.2.136.97
50	10.2.136.98/31	10.2.136.98 – 10.2.136.99	10.2.136.99
51	10.2.136.100/31	10.2.136.100 – 10.2.136.101	10.2.136.101
52	10.2.136.102/31	10.2.136.102 – 10.2.136.103	10.2.136.103
53	10.2.136.104/31	10.2.136.104 – 10.2.136.105	10.2.136.105
54	10.2.136.106/31	10.2.136.106 – 10.2.136.107	10.2.136.107
55	10.2.136.108/31	10.2.136.108 – 10.2.136.109	10.2.136.109
56	10.2.136.110/31	10.2.136.110 – 10.2.136.111	10.2.136.111
57	10.2.136.112/31	10.2.136.112 – 10.2.136.113	10.2.136.113
58	10.2.136.114/31	10.2.136.114 – 10.2.136.115	10.2.136.115
59	10.2.136.116/31	10.2.136.116 – 10.2.136.117	10.2.136.117
60	10.2.136.118/31	10.2.136.118 – 10.2.136.119	10.2.136.119
61	10.2.136.120/31	10.2.136.120 – 10.2.136.121	10.2.136.121
62	10.2.136.122/31	10.2.136.122 – 10.2.136.123	10.2.136.123
63	10.2.136.124/31	10.2.136.124 – 10.2.136.125	10.2.136.125
64	10.2.136.126/31	10.2.136.126 – 10.2.136.127	10.2.136.127
65	10.2.136.128/31	10.2.136.128 – 10.2.136.129	10.2.136.129
66	10.2.136.130/31	10.2.136.130 – 10.2.136.131	10.2.136.131
67	10.2.136.132/31	10.2.136.132 – 10.2.136.133	10.2.136.133
68	10.2.136.134/31	10.2.136.134 – 10.2.136.135	10.2.136.135
69	10.2.136.136/31	10.2.136.136 – 10.2.136.137	10.2.136.137
70	10.2.136.138/31	10.2.136.138 – 10.2.136.139	10.2.136.139
71	10.2.136.140/31	10.2.136.140 – 10.2.136.141	10.2.136.141
72	10.2.136.142/31	10.2.136.142 – 10.2.136.143	10.2.136.143
73	10.2.136.144/31	10.2.136.144 – 10.2.136.145	10.2.136.145
74	10.2.136.146/31	10.2.136.146 – 10.2.136.147	10.2.136.147
75	10.2.136.148/31	10.2.136.148 – 10.2.136.149	10.2.136.149
76	10.2.136.150/31	10.2.136.150 – 10.2.136.151	10.2.136.151
77	10.2.136.152/31	10.2.136.152 – 10.2.136.153	10.2.136.153
78	10.2.136.154/31	10.2.136.154 – 10.2.136.155	10.2.136.155
79	10.2.136.156/31	10.2.136.156 – 10.2.136.157	10.2.136.157
80	10.2.136.158/31	10.2.136.158 – 10.2.136.159	10.2.136.159
81	10.2.136.160/31	10.2.136.160 – 10.2.136.161	10.2.136.161
82	10.2.136.162/31	10.2.136.162 – 10.2.136.163	10.2.136.163
83	10.2.136.164/31	10.2.136.164 – 10.2.136.165	10.2.136.165
84	10.2.136.166/31	10.2.136.166 – 10.2.136.167	10.2.136.167
85	10.2.136.168/31	10.2.136.168 – 10.2.136.169	10.2.136.169
86	10.2.136.170/31	10.2.136.170 – 10.2.136.171	10.2.136.171
87	10.2.136.172/31	10.2.136.172 – 10.2.136.173	10.2.136.173
88	10.2.136.174/31	10.2.136.174 – 10.2.136.175	10.2.136.175
89	10.2.136.176/31	10.2.136.176 – 10.2.136.177	10.2.136.177
90	10.2.136.178/31	10.2.136.178 – 10.2.136.179	10.2.136.179
91	10.2.136.180/31	10.2.136.180 – 10.2.136.181	10.2.136.181
92	10.2.136.182/31	10.2.136.182 – 10.2.136.183	10.2.136.183
93	10.2.136.184/31	10.2.136.184 – 10.2.136.185	10.2.136.185
94	10.2.136.186/31	10.2.136.186 – 10.2.136.187	10.2.136.187
95	10.2.136.188/31	10.2.136.188 – 10.2.136.189	10.2.136.189
96	10.2.136.190/31	10.2.136.190 – 10.2.136.191	10.2.136.191
97	10.2.136.192/31	10.2.136.192 – 10.2.136.193	10.2.136.193
98	10.2.136.194/31	10.2.136.194 – 10.2.136.195	10.2.136.195
99	10.2.136.196/31	10.2.136.196 – 10.2.136.197	10.2.136.197
100	10.2.136.198/31	10.2.136.198 – 10.2.136.199	10.2.136.199
101	10.2.136.200/31	10.2.136.200 – 10.2.136.201	10.2.136.201
102	10.2.136.202/31	10.2.136.202 – 10.2.136.203	10.2.136.203
103	10.2.136.204/31	10.2.136.204 – 10.2.136.205	10.2.136.205
104	10.2.136.206/31	10.2.136.206 – 10.2.136.207	10.2.136.207
105	10.2.136.208/31	10.2.136.208 – 10.2.136.209	10.2.136.209
106	10.2.136.210/31	10.2.136.210 – 10.2.136.211	10.2.136.211
107	10.2.136.212/31	10.2.136.212 – 10.2.136.213	10.2.136.213
108	10.2.136.214/31	10.2.136.214 – 10.2.136.215	10.2.136.215
109	10.2.136.216/31	10.2.136.216 – 10.2.136.217	10.2.136.217
110	10.2.136.218/31	10.2.136.218 – 10.2.136.219	10.2.136.219
111	10.2.136.220/31	10.2.136.220 – 10.2.136.221	10.2.136.221
112	10.2.136.222/31	10.2.136.222 – 10.2.136.223	10.2.136.223
113	10.2.136.224/31	10.2.136.224 – 10.2.136.225	10.2.136.225
114	10.2.136.226/31	10.2.136.226 – 10.2.136.227	10.2.136.227
115	10.2.136.228/31	10.2.136.228 – 10.2.136.229	10.2.136.229
116	10.2.136.230/31	10.2.136.230 – 10.2.136.231	10.2.136.231
117	10.2.136.232/31	10.2.136.232 – 10.2.136.233	10.2.136.233
118	10.2.136.234/31	10.2.136.234 – 10.2.136.235	10.2.136.235
119	10.2.136.236/31	10.2.136.236 – 10.2.136.237	10.2.136.237
120	10.2.136.238/31	10.2.136.238 – 10.2.136.239	10.2.136.239
121	10.2.136.240/31	10.2.136.240 – 10.2.136.241	10.2.136.241
122	10.2.136.242/31	10.2.136.242 – 10.2.136.243	10.2.136.243
123	10.2.136.244/31	10.2.136.244 – 10.2.136.245	10.2.136.245
124	10.2.136.246/31	10.2.136.246 – 10.2.136.247	10.2.136.247
125	10.2.136.248/31	10.2.136.248 – 10.2.136.249	10.2.136.249
126	10.2.136.250/31	10.2.136.250 – 10.2.136.251	10.2.136.251
127	10.2.136.252/31	10.2.136.252 – 10.2.136.253	10.2.136.253
128	10.2.136.254/31	10.2.136.254 – 10.2.136.255	10.2.136.255
129	10.2.137.0/31	10.2.137.0 – 10.2.137.1	10.2.137.1
130	10.2.137.2/31	10.2.137.2 – 10.2.137.3	10.2.137.3
131	10.2.137.4/31	10.2.137.4 – 10.2.137.5	10.2.137.5
132	10.2.137.6/31	10.2.137.6 – 10.2.137.7	10.2.137.7
133	10.2.137.8/31	10.2.137.8 – 10.2.137.9	10.2.137.9
134	10.2.137.10/31	10.2.137.10 – 10.2.137.11	10.2.137.11
135	10.2.137.12/31	10.2.137.12 – 10.2.137.13	10.2.137.13
136	10.2.137.14/31	10.2.137.14 – 10.2.137.15	10.2.137.15
137	10.2.137.16/31	10.2.137.16 – 10.2.137.17	10.2.137.17
138	10.2.137.18/31	10.2.137.18 – 10.2.137.19	10.2.137.19
139	10.2.137.20/31	10.2.137.20 – 10.2.137.21	10.2.137.21
140	10.2.137.22/31	10.2.137.22 – 10.2.137.23	10.2.137.23
141	10.2.137.24/31	10.2.137.24 – 10.2.137.25	10.2.137.25
142	10.2.137.26/31	10.2.137.26 – 10.2.137.27	10.2.137.27
143	10.2.137.28/31	10.2.137.28 – 10.2.137.29	10.2.137.29
144	10.2.137.30/31	10.2.137.30 – 10.2.137.31	10.2.137.31
145	10.2.137.32/31	10.2.137.32 – 10.2.137.33	10.2.137.33
146	10.2.137.34/31	10.2.137.34 – 10.2.137.35	10.2.137.35
147	10.2.137.36/31	10.2.137.36 – 10.2.137.37	10.2.137.37
148	10.2.137.38/31	10.2.137.38 – 10.2.137.39	10.2.137.39
149	10.2.137.40/31	10.2.137.40 – 10.2.137.41	10.2.137.41
150	10.2.137.42/31	10.2.137.42 – 10.2.137.43	10.2.137.43
151	10.2.137.44/31	10.2.137.44 – 10.2.137.45	10.2.137.45
152	10.2.137.46/31	10.2.137.46 – 10.2.137.47	10.2.137.47
153	10.2.137.48/31	10.2.137.48 – 10.2.137.49	10.2.137.49
154	10.2.137.50/31	10.2.137.50 – 10.2.137.51	10.2.137.51
155	10.2.137.52/31	10.2.137.52 – 10.2.137.53	10.2.137.53
156	10.2.137.54/31	10.2.137.54 – 10.2.137.55	10.2.137.55
157	10.2.137.56/31	10.2.137.56 – 10.2.137.57	10.2.137.57
158	10.2.137.58/31	10.2.137.58 – 10.2.137.59	10.2.137.59
159	10.2.137.60/31	10.2.137.60 – 10.2.137.61	10.2.137.61
160	10.2.137.62/31	10.2.137.62 – 10.2.137.63	10.2.137.63
161	10.2.137.64/31	10.2.137.64 – 10.2.137.65	10.2.137.65
162	10.2.137.66/31	10.2.137.66 – 10.2.137.67	10.2.137.67
163	10.2.137.68/31	10.2.137.68 – 10.2.137.69	10.2.137.69
164	10.2.137.70/31	10.2.137.70 – 10.2.137.71	10.2.137.71
165	10.2.137.72/31	10.2.137.72 – 10.2.137.73	10.2.137.73
166	10.2.137.74/31	10.2.137.74 – 10.2.137.75	10.2.137.75
167	10.2.137.76/31	10.2.137.76 – 10.2.137.77	10.2.137.77
168	10.2.137.78/31	10.2.137.78 – 10.2.137.79	10.2.137.79
169	10.2.137.80/31	10.2.137.80 – 10.2.137.81	10.2.137.81
170	10.2.137.82/31	10.2.137.82 – 10.2.137.83	10.2.137.83
171	10.2.137.84/31	10.2.137.84 – 10.2.137.85	10.2.137.85
172	10.2.137.86/31	10.2.137.86 – 10.2.137.87	10.2.137.87
173	10.2.137.88/31	10.2.137.88 – 10.2.137.89	10.2.137.89
174	10.2.137.90/31	10.2.137.90 – 10.2.137.91	10.2.137.91
175	10.2.137.92/31	10.2.137.92 – 10.2.137.93	10.2.137.93
176	10.2.137.94/31	10.2.137.94 – 10.2.137.95	10.2.137.95
177	10.2.137.96/31	10.2.137.96 – 10.2.137.97	10.2.137.97
178	10.2.137.98/31	10.2.137.98 – 10.2.137.99	10.2.137.99
179	10.2.137.100/31	10.2.137.100 – 10.2.137.101	10.2.137.101
180	10.2.137.102/31	10.2.137.102 – 10.2.137.103	10.2.137.103
181	10.2.137.104/31	10.2.137.104 – 10.2.137.105	10.2.137.105
182	10.2.137.106/31	10.2.137.106 – 10.2.137.107	10.2.137.107
183	10.2.137.108/31	10.2.137.108 – 10.2.137.109	10.2.137.109
184	10.2.137.110/31	10.2.137.110 – 10.2.137.111	10.2.137.111
185	10.2.137.112/31	10.2.137.112 – 10.2.137.113	10.2.137.113
186	10.2.137.114/31	10.2.137.114 – 10.2.137.115	10.2.137.115
187	10.2.137.116/31	10.2.137.116 – 10.2.137.117	10.2.137.117
188	10.2.137.118/31	10.2.137.118 – 10.2.137.119	10.2.137.119
189	10.2.137.120/31	10.2.137.120 – 10.2.137.121	10.2.137.121
190	10.2.137.122/31	10.2.137.122 – 10.2.137.123	10.2.137.123
191	10.2.137.124/31	10.2.137.124 – 10.2.137.125	10.2.137.125
192	10.2.137.126/31	10.2.137.126 – 10.2.137.127	10.2.137.127
193	10.2.137.128/31	10.2.137.128 – 10.2.137.129	10.2.137.129
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196	10.2.137.134/31	10.2.137.134 – 10.2.137.135	10.2.137.135
197	10.2.137.136/31	10.2.137.136 – 10.2.137.137	10.2.137.137
198	10.2.137.138/31	10.2.137.138 – 10.2.137.139	10.2.137.139
199	10.2.137.140/31	10.2.137.140 – 10.2.137.141	10.2.137.141
200	10.2.137.142/31	10.2.137.142 – 10.2.137.143	10.2.137.143
201	10.2.137.144/31	10.2.137.144 – 10.2.137.145	10.2.137.145
202	10.2.137.146/31	10.2.137.146 – 10.2.137.147	10.2.137.147
203	10.2.137.148/31	10.2.137.148 – 10.2.137.149	10.2.137.149
204	10.2.137.150/31	10.2.137.150 – 10.2.137.151	10.2.137.151
205	10.2.137.152/31	10.2.137.152 – 10.2.137.153	10.2.137.153
206	10.2.137.154/31	10.2.137.154 – 10.2.137.155	10.2.137.155
207	10.2.137.156/31	10.2.137.156 – 10.2.137.157	10.2.137.157
208	10.2.137.158/31	10.2.137.158 – 10.2.137.159	10.2.137.159
209	10.2.137.160/31	10.2.137.160 – 10.2.137.161	10.2.137.161
210	10.2.137.162/31	10.2.137.162 – 10.2.137.163	10.2.137.163
211	10.2.137.164/31	10.2.137.164 – 10.2.137.165	10.2.137.165
212	10.2.137.166/31	10.2.137.166 – 10.2.137.167	10.2.137.167
213	10.2.137.168/31	10.2.137.168 – 10.2.137.169	10.2.137.169
214	10.2.137.170/31	10.2.137.170 – 10.2.137.171	10.2.137.171
215	10.2.137.172/31	10.2.137.172 – 10.2.137.173	10.2.137.173
216	10.2.137.174/31	10.2.137.174 – 10.2.137.175	10.2.137.175
217	10.2.137.176/31	10.2.137.176 – 10.2.137.177	10.2.137.177
218	10.2.137.178/31	10.2.137.178 – 10.2.137.179	10.2.137.179
219	10.2.137.180/31	10.2.137.180 – 10.2.137.181	10.2.137.181
220	10.2.137.182/31	10.2.137.182 – 10.2.137.183	10.2.137.183
221	10.2.137.184/31	10.2.137.184 – 10.2.137.185	10.2.137.185
222	10.2.137.186/31	10.2.137.186 – 10.2.137.187	10.2.137.187
223	10.2.137.188/31	10.2.137.188 – 10.2.137.189	10.2.137.189
224	10.2.137.190/31	10.2.137.190 – 10.2.137.191	10.2.137.191
225	10.2.137.192/31	10.2.137.192 – 10.2.137.193	10.2.137.193
226	10.2.137.194/31	10.2.137.194 – 10.2.137.195	10.2.137.195
227	10.2.137.196/31	10.2.137.196 – 10.2.137.197	10.2.137.197
228	10.2.137.198/31	10.2.137.198 – 10.2.137.199	10.2.137.199
229	10.2.137.200/31	10.2.137.200 – 10.2.137.201	10.2.137.201
230	10.2.137.202/31	10.2.137.202 – 10.2.137.203	10.2.137.203
231	10.2.137.204/31	10.2.137.204 – 10.2.137.205	10.2.137.205
232	10.2.137.206/31	10.2.137.206 – 10.2.137.207	10.2.137.207
233	10.2.137.208/31	10.2.137.208 – 10.2.137.209	10.2.137.209
234	10.2.137.210/31	10.2.137.210 – 10.2.137.211	10.2.137.211
235	10.2.137.212/31	10.2.137.212 – 10.2.137.213	10.2.137.213
236	10.2.137.214/31	10.2.137.214 – 10.2.137.215	10.2.137.215
237	10.2.137.216/31	10.2.137.216 – 10.2.137.217	10.2.137.217
238	10.2.137.218/31	10.2.137.218 – 10.2.137.219	10.2.137.219
239	10.2.137.220/31	10.2.137.220 – 10.2.137.221	10.2.137.221
240	10.2.137.222/31	10.2.137.222 – 10.2.137.223	10.2.137.223
241	10.2.137.224/31	10.2.137.224 – 10.2.137.225	10.2.137.225
242	10.2.137.226/31	10.2.137.226 – 10.2.137.227	10.2.137.227
243	10.2.137.228/31	10.2.137.228 – 10.2.137.229	10.2.137.229
244	10.2.137.230/31	10.2.137.230 – 10.2.137.231	10.2.137.231
245	10.2.137.232/31	10.2.137.232 – 10.2.137.233	10.2.137.233
246	10.2.137.234/31	10.2.137.234 – 10.2.137.235	10.2.137.235
247	10.2.137.236/31	10.2.137.236 – 10.2.137.237	10.2.137.237
248	10.2.137.238/31	10.2.137.238 – 10.2.137.239	10.2.137.239
249	10.2.137.240/31	10.2.137.240 – 10.2.137.241	10.2.137.241
250	10.2.137.242/31	10.2.137.242 – 10.2.137.243	10.2.137.243
251	10.2.137.244/31	10.2.137.244 – 10.2.137.245	10.2.137.245
252	10.2.137.246/31	10.2.137.246 – 10.2.137.247	10.2.137.247
253	10.2.137.248/31	10.2.137.248 – 10.2.137.249	10.2.137.249
254	10.2.137.250/31	10.2.137.250 – 10.2.137.251	10.2.137.251
255	10.2.137.252/31	10.2.137.252 – 10.2.137.253	10.2.137.253
256	10.2.137.254/31	10.2.137.254 – 10.2.137.255	10.2.137.255

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 →