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)10.3.136.0/21

network10.3.136.0/21

broadcast10.3.143.255

first host10.3.136.1

last host10.3.143.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.136.0/21

address00001010.00000011.10001000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.10001000.00000000

broadcast00001010.00000011.10001111.11111111

green = network part, grey = host part

hex0x0a038800

decimal168003584

reverse dns0.136.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:8800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.3.136.0/30	10.3.136.1 – 10.3.136.2	10.3.136.3
2	10.3.136.4/30	10.3.136.5 – 10.3.136.6	10.3.136.7
3	10.3.136.8/30	10.3.136.9 – 10.3.136.10	10.3.136.11
4	10.3.136.12/30	10.3.136.13 – 10.3.136.14	10.3.136.15
5	10.3.136.16/30	10.3.136.17 – 10.3.136.18	10.3.136.19
6	10.3.136.20/30	10.3.136.21 – 10.3.136.22	10.3.136.23
7	10.3.136.24/30	10.3.136.25 – 10.3.136.26	10.3.136.27
8	10.3.136.28/30	10.3.136.29 – 10.3.136.30	10.3.136.31
9	10.3.136.32/30	10.3.136.33 – 10.3.136.34	10.3.136.35
10	10.3.136.36/30	10.3.136.37 – 10.3.136.38	10.3.136.39
11	10.3.136.40/30	10.3.136.41 – 10.3.136.42	10.3.136.43
12	10.3.136.44/30	10.3.136.45 – 10.3.136.46	10.3.136.47
13	10.3.136.48/30	10.3.136.49 – 10.3.136.50	10.3.136.51
14	10.3.136.52/30	10.3.136.53 – 10.3.136.54	10.3.136.55
15	10.3.136.56/30	10.3.136.57 – 10.3.136.58	10.3.136.59
16	10.3.136.60/30	10.3.136.61 – 10.3.136.62	10.3.136.63
17	10.3.136.64/30	10.3.136.65 – 10.3.136.66	10.3.136.67
18	10.3.136.68/30	10.3.136.69 – 10.3.136.70	10.3.136.71
19	10.3.136.72/30	10.3.136.73 – 10.3.136.74	10.3.136.75
20	10.3.136.76/30	10.3.136.77 – 10.3.136.78	10.3.136.79
21	10.3.136.80/30	10.3.136.81 – 10.3.136.82	10.3.136.83
22	10.3.136.84/30	10.3.136.85 – 10.3.136.86	10.3.136.87
23	10.3.136.88/30	10.3.136.89 – 10.3.136.90	10.3.136.91
24	10.3.136.92/30	10.3.136.93 – 10.3.136.94	10.3.136.95
25	10.3.136.96/30	10.3.136.97 – 10.3.136.98	10.3.136.99
26	10.3.136.100/30	10.3.136.101 – 10.3.136.102	10.3.136.103
27	10.3.136.104/30	10.3.136.105 – 10.3.136.106	10.3.136.107
28	10.3.136.108/30	10.3.136.109 – 10.3.136.110	10.3.136.111
29	10.3.136.112/30	10.3.136.113 – 10.3.136.114	10.3.136.115
30	10.3.136.116/30	10.3.136.117 – 10.3.136.118	10.3.136.119
31	10.3.136.120/30	10.3.136.121 – 10.3.136.122	10.3.136.123
32	10.3.136.124/30	10.3.136.125 – 10.3.136.126	10.3.136.127
33	10.3.136.128/30	10.3.136.129 – 10.3.136.130	10.3.136.131
34	10.3.136.132/30	10.3.136.133 – 10.3.136.134	10.3.136.135
35	10.3.136.136/30	10.3.136.137 – 10.3.136.138	10.3.136.139
36	10.3.136.140/30	10.3.136.141 – 10.3.136.142	10.3.136.143
37	10.3.136.144/30	10.3.136.145 – 10.3.136.146	10.3.136.147
38	10.3.136.148/30	10.3.136.149 – 10.3.136.150	10.3.136.151
39	10.3.136.152/30	10.3.136.153 – 10.3.136.154	10.3.136.155
40	10.3.136.156/30	10.3.136.157 – 10.3.136.158	10.3.136.159
41	10.3.136.160/30	10.3.136.161 – 10.3.136.162	10.3.136.163
42	10.3.136.164/30	10.3.136.165 – 10.3.136.166	10.3.136.167
43	10.3.136.168/30	10.3.136.169 – 10.3.136.170	10.3.136.171
44	10.3.136.172/30	10.3.136.173 – 10.3.136.174	10.3.136.175
45	10.3.136.176/30	10.3.136.177 – 10.3.136.178	10.3.136.179
46	10.3.136.180/30	10.3.136.181 – 10.3.136.182	10.3.136.183
47	10.3.136.184/30	10.3.136.185 – 10.3.136.186	10.3.136.187
48	10.3.136.188/30	10.3.136.189 – 10.3.136.190	10.3.136.191
49	10.3.136.192/30	10.3.136.193 – 10.3.136.194	10.3.136.195
50	10.3.136.196/30	10.3.136.197 – 10.3.136.198	10.3.136.199
51	10.3.136.200/30	10.3.136.201 – 10.3.136.202	10.3.136.203
52	10.3.136.204/30	10.3.136.205 – 10.3.136.206	10.3.136.207
53	10.3.136.208/30	10.3.136.209 – 10.3.136.210	10.3.136.211
54	10.3.136.212/30	10.3.136.213 – 10.3.136.214	10.3.136.215
55	10.3.136.216/30	10.3.136.217 – 10.3.136.218	10.3.136.219
56	10.3.136.220/30	10.3.136.221 – 10.3.136.222	10.3.136.223
57	10.3.136.224/30	10.3.136.225 – 10.3.136.226	10.3.136.227
58	10.3.136.228/30	10.3.136.229 – 10.3.136.230	10.3.136.231
59	10.3.136.232/30	10.3.136.233 – 10.3.136.234	10.3.136.235
60	10.3.136.236/30	10.3.136.237 – 10.3.136.238	10.3.136.239
61	10.3.136.240/30	10.3.136.241 – 10.3.136.242	10.3.136.243
62	10.3.136.244/30	10.3.136.245 – 10.3.136.246	10.3.136.247
63	10.3.136.248/30	10.3.136.249 – 10.3.136.250	10.3.136.251
64	10.3.136.252/30	10.3.136.253 – 10.3.136.254	10.3.136.255
65	10.3.137.0/30	10.3.137.1 – 10.3.137.2	10.3.137.3
66	10.3.137.4/30	10.3.137.5 – 10.3.137.6	10.3.137.7
67	10.3.137.8/30	10.3.137.9 – 10.3.137.10	10.3.137.11
68	10.3.137.12/30	10.3.137.13 – 10.3.137.14	10.3.137.15
69	10.3.137.16/30	10.3.137.17 – 10.3.137.18	10.3.137.19
70	10.3.137.20/30	10.3.137.21 – 10.3.137.22	10.3.137.23
71	10.3.137.24/30	10.3.137.25 – 10.3.137.26	10.3.137.27
72	10.3.137.28/30	10.3.137.29 – 10.3.137.30	10.3.137.31
73	10.3.137.32/30	10.3.137.33 – 10.3.137.34	10.3.137.35
74	10.3.137.36/30	10.3.137.37 – 10.3.137.38	10.3.137.39
75	10.3.137.40/30	10.3.137.41 – 10.3.137.42	10.3.137.43
76	10.3.137.44/30	10.3.137.45 – 10.3.137.46	10.3.137.47
77	10.3.137.48/30	10.3.137.49 – 10.3.137.50	10.3.137.51
78	10.3.137.52/30	10.3.137.53 – 10.3.137.54	10.3.137.55
79	10.3.137.56/30	10.3.137.57 – 10.3.137.58	10.3.137.59
80	10.3.137.60/30	10.3.137.61 – 10.3.137.62	10.3.137.63
81	10.3.137.64/30	10.3.137.65 – 10.3.137.66	10.3.137.67
82	10.3.137.68/30	10.3.137.69 – 10.3.137.70	10.3.137.71
83	10.3.137.72/30	10.3.137.73 – 10.3.137.74	10.3.137.75
84	10.3.137.76/30	10.3.137.77 – 10.3.137.78	10.3.137.79
85	10.3.137.80/30	10.3.137.81 – 10.3.137.82	10.3.137.83
86	10.3.137.84/30	10.3.137.85 – 10.3.137.86	10.3.137.87
87	10.3.137.88/30	10.3.137.89 – 10.3.137.90	10.3.137.91
88	10.3.137.92/30	10.3.137.93 – 10.3.137.94	10.3.137.95
89	10.3.137.96/30	10.3.137.97 – 10.3.137.98	10.3.137.99
90	10.3.137.100/30	10.3.137.101 – 10.3.137.102	10.3.137.103
91	10.3.137.104/30	10.3.137.105 – 10.3.137.106	10.3.137.107
92	10.3.137.108/30	10.3.137.109 – 10.3.137.110	10.3.137.111
93	10.3.137.112/30	10.3.137.113 – 10.3.137.114	10.3.137.115
94	10.3.137.116/30	10.3.137.117 – 10.3.137.118	10.3.137.119
95	10.3.137.120/30	10.3.137.121 – 10.3.137.122	10.3.137.123
96	10.3.137.124/30	10.3.137.125 – 10.3.137.126	10.3.137.127
97	10.3.137.128/30	10.3.137.129 – 10.3.137.130	10.3.137.131
98	10.3.137.132/30	10.3.137.133 – 10.3.137.134	10.3.137.135
99	10.3.137.136/30	10.3.137.137 – 10.3.137.138	10.3.137.139
100	10.3.137.140/30	10.3.137.141 – 10.3.137.142	10.3.137.143
101	10.3.137.144/30	10.3.137.145 – 10.3.137.146	10.3.137.147
102	10.3.137.148/30	10.3.137.149 – 10.3.137.150	10.3.137.151
103	10.3.137.152/30	10.3.137.153 – 10.3.137.154	10.3.137.155
104	10.3.137.156/30	10.3.137.157 – 10.3.137.158	10.3.137.159
105	10.3.137.160/30	10.3.137.161 – 10.3.137.162	10.3.137.163
106	10.3.137.164/30	10.3.137.165 – 10.3.137.166	10.3.137.167
107	10.3.137.168/30	10.3.137.169 – 10.3.137.170	10.3.137.171
108	10.3.137.172/30	10.3.137.173 – 10.3.137.174	10.3.137.175
109	10.3.137.176/30	10.3.137.177 – 10.3.137.178	10.3.137.179
110	10.3.137.180/30	10.3.137.181 – 10.3.137.182	10.3.137.183
111	10.3.137.184/30	10.3.137.185 – 10.3.137.186	10.3.137.187
112	10.3.137.188/30	10.3.137.189 – 10.3.137.190	10.3.137.191
113	10.3.137.192/30	10.3.137.193 – 10.3.137.194	10.3.137.195
114	10.3.137.196/30	10.3.137.197 – 10.3.137.198	10.3.137.199
115	10.3.137.200/30	10.3.137.201 – 10.3.137.202	10.3.137.203
116	10.3.137.204/30	10.3.137.205 – 10.3.137.206	10.3.137.207
117	10.3.137.208/30	10.3.137.209 – 10.3.137.210	10.3.137.211
118	10.3.137.212/30	10.3.137.213 – 10.3.137.214	10.3.137.215
119	10.3.137.216/30	10.3.137.217 – 10.3.137.218	10.3.137.219
120	10.3.137.220/30	10.3.137.221 – 10.3.137.222	10.3.137.223
121	10.3.137.224/30	10.3.137.225 – 10.3.137.226	10.3.137.227
122	10.3.137.228/30	10.3.137.229 – 10.3.137.230	10.3.137.231
123	10.3.137.232/30	10.3.137.233 – 10.3.137.234	10.3.137.235
124	10.3.137.236/30	10.3.137.237 – 10.3.137.238	10.3.137.239
125	10.3.137.240/30	10.3.137.241 – 10.3.137.242	10.3.137.243
126	10.3.137.244/30	10.3.137.245 – 10.3.137.246	10.3.137.247
127	10.3.137.248/30	10.3.137.249 – 10.3.137.250	10.3.137.251
128	10.3.137.252/30	10.3.137.253 – 10.3.137.254	10.3.137.255
129	10.3.138.0/30	10.3.138.1 – 10.3.138.2	10.3.138.3
130	10.3.138.4/30	10.3.138.5 – 10.3.138.6	10.3.138.7
131	10.3.138.8/30	10.3.138.9 – 10.3.138.10	10.3.138.11
132	10.3.138.12/30	10.3.138.13 – 10.3.138.14	10.3.138.15
133	10.3.138.16/30	10.3.138.17 – 10.3.138.18	10.3.138.19
134	10.3.138.20/30	10.3.138.21 – 10.3.138.22	10.3.138.23
135	10.3.138.24/30	10.3.138.25 – 10.3.138.26	10.3.138.27
136	10.3.138.28/30	10.3.138.29 – 10.3.138.30	10.3.138.31
137	10.3.138.32/30	10.3.138.33 – 10.3.138.34	10.3.138.35
138	10.3.138.36/30	10.3.138.37 – 10.3.138.38	10.3.138.39
139	10.3.138.40/30	10.3.138.41 – 10.3.138.42	10.3.138.43
140	10.3.138.44/30	10.3.138.45 – 10.3.138.46	10.3.138.47
141	10.3.138.48/30	10.3.138.49 – 10.3.138.50	10.3.138.51
142	10.3.138.52/30	10.3.138.53 – 10.3.138.54	10.3.138.55
143	10.3.138.56/30	10.3.138.57 – 10.3.138.58	10.3.138.59
144	10.3.138.60/30	10.3.138.61 – 10.3.138.62	10.3.138.63
145	10.3.138.64/30	10.3.138.65 – 10.3.138.66	10.3.138.67
146	10.3.138.68/30	10.3.138.69 – 10.3.138.70	10.3.138.71
147	10.3.138.72/30	10.3.138.73 – 10.3.138.74	10.3.138.75
148	10.3.138.76/30	10.3.138.77 – 10.3.138.78	10.3.138.79
149	10.3.138.80/30	10.3.138.81 – 10.3.138.82	10.3.138.83
150	10.3.138.84/30	10.3.138.85 – 10.3.138.86	10.3.138.87
151	10.3.138.88/30	10.3.138.89 – 10.3.138.90	10.3.138.91
152	10.3.138.92/30	10.3.138.93 – 10.3.138.94	10.3.138.95
153	10.3.138.96/30	10.3.138.97 – 10.3.138.98	10.3.138.99
154	10.3.138.100/30	10.3.138.101 – 10.3.138.102	10.3.138.103
155	10.3.138.104/30	10.3.138.105 – 10.3.138.106	10.3.138.107
156	10.3.138.108/30	10.3.138.109 – 10.3.138.110	10.3.138.111
157	10.3.138.112/30	10.3.138.113 – 10.3.138.114	10.3.138.115
158	10.3.138.116/30	10.3.138.117 – 10.3.138.118	10.3.138.119
159	10.3.138.120/30	10.3.138.121 – 10.3.138.122	10.3.138.123
160	10.3.138.124/30	10.3.138.125 – 10.3.138.126	10.3.138.127
161	10.3.138.128/30	10.3.138.129 – 10.3.138.130	10.3.138.131
162	10.3.138.132/30	10.3.138.133 – 10.3.138.134	10.3.138.135
163	10.3.138.136/30	10.3.138.137 – 10.3.138.138	10.3.138.139
164	10.3.138.140/30	10.3.138.141 – 10.3.138.142	10.3.138.143
165	10.3.138.144/30	10.3.138.145 – 10.3.138.146	10.3.138.147
166	10.3.138.148/30	10.3.138.149 – 10.3.138.150	10.3.138.151
167	10.3.138.152/30	10.3.138.153 – 10.3.138.154	10.3.138.155
168	10.3.138.156/30	10.3.138.157 – 10.3.138.158	10.3.138.159
169	10.3.138.160/30	10.3.138.161 – 10.3.138.162	10.3.138.163
170	10.3.138.164/30	10.3.138.165 – 10.3.138.166	10.3.138.167
171	10.3.138.168/30	10.3.138.169 – 10.3.138.170	10.3.138.171
172	10.3.138.172/30	10.3.138.173 – 10.3.138.174	10.3.138.175
173	10.3.138.176/30	10.3.138.177 – 10.3.138.178	10.3.138.179
174	10.3.138.180/30	10.3.138.181 – 10.3.138.182	10.3.138.183
175	10.3.138.184/30	10.3.138.185 – 10.3.138.186	10.3.138.187
176	10.3.138.188/30	10.3.138.189 – 10.3.138.190	10.3.138.191
177	10.3.138.192/30	10.3.138.193 – 10.3.138.194	10.3.138.195
178	10.3.138.196/30	10.3.138.197 – 10.3.138.198	10.3.138.199
179	10.3.138.200/30	10.3.138.201 – 10.3.138.202	10.3.138.203
180	10.3.138.204/30	10.3.138.205 – 10.3.138.206	10.3.138.207
181	10.3.138.208/30	10.3.138.209 – 10.3.138.210	10.3.138.211
182	10.3.138.212/30	10.3.138.213 – 10.3.138.214	10.3.138.215
183	10.3.138.216/30	10.3.138.217 – 10.3.138.218	10.3.138.219
184	10.3.138.220/30	10.3.138.221 – 10.3.138.222	10.3.138.223
185	10.3.138.224/30	10.3.138.225 – 10.3.138.226	10.3.138.227
186	10.3.138.228/30	10.3.138.229 – 10.3.138.230	10.3.138.231
187	10.3.138.232/30	10.3.138.233 – 10.3.138.234	10.3.138.235
188	10.3.138.236/30	10.3.138.237 – 10.3.138.238	10.3.138.239
189	10.3.138.240/30	10.3.138.241 – 10.3.138.242	10.3.138.243
190	10.3.138.244/30	10.3.138.245 – 10.3.138.246	10.3.138.247
191	10.3.138.248/30	10.3.138.249 – 10.3.138.250	10.3.138.251
192	10.3.138.252/30	10.3.138.253 – 10.3.138.254	10.3.138.255
193	10.3.139.0/30	10.3.139.1 – 10.3.139.2	10.3.139.3
194	10.3.139.4/30	10.3.139.5 – 10.3.139.6	10.3.139.7
195	10.3.139.8/30	10.3.139.9 – 10.3.139.10	10.3.139.11
196	10.3.139.12/30	10.3.139.13 – 10.3.139.14	10.3.139.15
197	10.3.139.16/30	10.3.139.17 – 10.3.139.18	10.3.139.19
198	10.3.139.20/30	10.3.139.21 – 10.3.139.22	10.3.139.23
199	10.3.139.24/30	10.3.139.25 – 10.3.139.26	10.3.139.27
200	10.3.139.28/30	10.3.139.29 – 10.3.139.30	10.3.139.31
201	10.3.139.32/30	10.3.139.33 – 10.3.139.34	10.3.139.35
202	10.3.139.36/30	10.3.139.37 – 10.3.139.38	10.3.139.39
203	10.3.139.40/30	10.3.139.41 – 10.3.139.42	10.3.139.43
204	10.3.139.44/30	10.3.139.45 – 10.3.139.46	10.3.139.47
205	10.3.139.48/30	10.3.139.49 – 10.3.139.50	10.3.139.51
206	10.3.139.52/30	10.3.139.53 – 10.3.139.54	10.3.139.55
207	10.3.139.56/30	10.3.139.57 – 10.3.139.58	10.3.139.59
208	10.3.139.60/30	10.3.139.61 – 10.3.139.62	10.3.139.63
209	10.3.139.64/30	10.3.139.65 – 10.3.139.66	10.3.139.67
210	10.3.139.68/30	10.3.139.69 – 10.3.139.70	10.3.139.71
211	10.3.139.72/30	10.3.139.73 – 10.3.139.74	10.3.139.75
212	10.3.139.76/30	10.3.139.77 – 10.3.139.78	10.3.139.79
213	10.3.139.80/30	10.3.139.81 – 10.3.139.82	10.3.139.83
214	10.3.139.84/30	10.3.139.85 – 10.3.139.86	10.3.139.87
215	10.3.139.88/30	10.3.139.89 – 10.3.139.90	10.3.139.91
216	10.3.139.92/30	10.3.139.93 – 10.3.139.94	10.3.139.95
217	10.3.139.96/30	10.3.139.97 – 10.3.139.98	10.3.139.99
218	10.3.139.100/30	10.3.139.101 – 10.3.139.102	10.3.139.103
219	10.3.139.104/30	10.3.139.105 – 10.3.139.106	10.3.139.107
220	10.3.139.108/30	10.3.139.109 – 10.3.139.110	10.3.139.111
221	10.3.139.112/30	10.3.139.113 – 10.3.139.114	10.3.139.115
222	10.3.139.116/30	10.3.139.117 – 10.3.139.118	10.3.139.119
223	10.3.139.120/30	10.3.139.121 – 10.3.139.122	10.3.139.123
224	10.3.139.124/30	10.3.139.125 – 10.3.139.126	10.3.139.127
225	10.3.139.128/30	10.3.139.129 – 10.3.139.130	10.3.139.131
226	10.3.139.132/30	10.3.139.133 – 10.3.139.134	10.3.139.135
227	10.3.139.136/30	10.3.139.137 – 10.3.139.138	10.3.139.139
228	10.3.139.140/30	10.3.139.141 – 10.3.139.142	10.3.139.143
229	10.3.139.144/30	10.3.139.145 – 10.3.139.146	10.3.139.147
230	10.3.139.148/30	10.3.139.149 – 10.3.139.150	10.3.139.151
231	10.3.139.152/30	10.3.139.153 – 10.3.139.154	10.3.139.155
232	10.3.139.156/30	10.3.139.157 – 10.3.139.158	10.3.139.159
233	10.3.139.160/30	10.3.139.161 – 10.3.139.162	10.3.139.163
234	10.3.139.164/30	10.3.139.165 – 10.3.139.166	10.3.139.167
235	10.3.139.168/30	10.3.139.169 – 10.3.139.170	10.3.139.171
236	10.3.139.172/30	10.3.139.173 – 10.3.139.174	10.3.139.175
237	10.3.139.176/30	10.3.139.177 – 10.3.139.178	10.3.139.179
238	10.3.139.180/30	10.3.139.181 – 10.3.139.182	10.3.139.183
239	10.3.139.184/30	10.3.139.185 – 10.3.139.186	10.3.139.187
240	10.3.139.188/30	10.3.139.189 – 10.3.139.190	10.3.139.191
241	10.3.139.192/30	10.3.139.193 – 10.3.139.194	10.3.139.195
242	10.3.139.196/30	10.3.139.197 – 10.3.139.198	10.3.139.199
243	10.3.139.200/30	10.3.139.201 – 10.3.139.202	10.3.139.203
244	10.3.139.204/30	10.3.139.205 – 10.3.139.206	10.3.139.207
245	10.3.139.208/30	10.3.139.209 – 10.3.139.210	10.3.139.211
246	10.3.139.212/30	10.3.139.213 – 10.3.139.214	10.3.139.215
247	10.3.139.216/30	10.3.139.217 – 10.3.139.218	10.3.139.219
248	10.3.139.220/30	10.3.139.221 – 10.3.139.222	10.3.139.223
249	10.3.139.224/30	10.3.139.225 – 10.3.139.226	10.3.139.227
250	10.3.139.228/30	10.3.139.229 – 10.3.139.230	10.3.139.231
251	10.3.139.232/30	10.3.139.233 – 10.3.139.234	10.3.139.235
252	10.3.139.236/30	10.3.139.237 – 10.3.139.238	10.3.139.239
253	10.3.139.240/30	10.3.139.241 – 10.3.139.242	10.3.139.243
254	10.3.139.244/30	10.3.139.245 – 10.3.139.246	10.3.139.247
255	10.3.139.248/30	10.3.139.249 – 10.3.139.250	10.3.139.251
256	10.3.139.252/30	10.3.139.253 – 10.3.139.254	10.3.139.255

showing 256 of 512

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 →