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)10.77.69.0/24

network10.77.69.0/24

broadcast10.77.69.255

first host10.77.69.1

last host10.77.69.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.77.69.0/24

address00001010.01001101.01000101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001101.01000101.00000000

broadcast00001010.01001101.01000101.11111111

green = network part, grey = host part

hex0x0a4d4500

decimal172836096

reverse dns0.69.77.10.in-addr.arpa

ipv4-mapped::ffff:a4d:4500

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.77.69.0/32	10.77.69.0 – 10.77.69.0	10.77.69.0
2	10.77.69.1/32	10.77.69.1 – 10.77.69.1	10.77.69.1
3	10.77.69.2/32	10.77.69.2 – 10.77.69.2	10.77.69.2
4	10.77.69.3/32	10.77.69.3 – 10.77.69.3	10.77.69.3
5	10.77.69.4/32	10.77.69.4 – 10.77.69.4	10.77.69.4
6	10.77.69.5/32	10.77.69.5 – 10.77.69.5	10.77.69.5
7	10.77.69.6/32	10.77.69.6 – 10.77.69.6	10.77.69.6
8	10.77.69.7/32	10.77.69.7 – 10.77.69.7	10.77.69.7
9	10.77.69.8/32	10.77.69.8 – 10.77.69.8	10.77.69.8
10	10.77.69.9/32	10.77.69.9 – 10.77.69.9	10.77.69.9
11	10.77.69.10/32	10.77.69.10 – 10.77.69.10	10.77.69.10
12	10.77.69.11/32	10.77.69.11 – 10.77.69.11	10.77.69.11
13	10.77.69.12/32	10.77.69.12 – 10.77.69.12	10.77.69.12
14	10.77.69.13/32	10.77.69.13 – 10.77.69.13	10.77.69.13
15	10.77.69.14/32	10.77.69.14 – 10.77.69.14	10.77.69.14
16	10.77.69.15/32	10.77.69.15 – 10.77.69.15	10.77.69.15
17	10.77.69.16/32	10.77.69.16 – 10.77.69.16	10.77.69.16
18	10.77.69.17/32	10.77.69.17 – 10.77.69.17	10.77.69.17
19	10.77.69.18/32	10.77.69.18 – 10.77.69.18	10.77.69.18
20	10.77.69.19/32	10.77.69.19 – 10.77.69.19	10.77.69.19
21	10.77.69.20/32	10.77.69.20 – 10.77.69.20	10.77.69.20
22	10.77.69.21/32	10.77.69.21 – 10.77.69.21	10.77.69.21
23	10.77.69.22/32	10.77.69.22 – 10.77.69.22	10.77.69.22
24	10.77.69.23/32	10.77.69.23 – 10.77.69.23	10.77.69.23
25	10.77.69.24/32	10.77.69.24 – 10.77.69.24	10.77.69.24
26	10.77.69.25/32	10.77.69.25 – 10.77.69.25	10.77.69.25
27	10.77.69.26/32	10.77.69.26 – 10.77.69.26	10.77.69.26
28	10.77.69.27/32	10.77.69.27 – 10.77.69.27	10.77.69.27
29	10.77.69.28/32	10.77.69.28 – 10.77.69.28	10.77.69.28
30	10.77.69.29/32	10.77.69.29 – 10.77.69.29	10.77.69.29
31	10.77.69.30/32	10.77.69.30 – 10.77.69.30	10.77.69.30
32	10.77.69.31/32	10.77.69.31 – 10.77.69.31	10.77.69.31
33	10.77.69.32/32	10.77.69.32 – 10.77.69.32	10.77.69.32
34	10.77.69.33/32	10.77.69.33 – 10.77.69.33	10.77.69.33
35	10.77.69.34/32	10.77.69.34 – 10.77.69.34	10.77.69.34
36	10.77.69.35/32	10.77.69.35 – 10.77.69.35	10.77.69.35
37	10.77.69.36/32	10.77.69.36 – 10.77.69.36	10.77.69.36
38	10.77.69.37/32	10.77.69.37 – 10.77.69.37	10.77.69.37
39	10.77.69.38/32	10.77.69.38 – 10.77.69.38	10.77.69.38
40	10.77.69.39/32	10.77.69.39 – 10.77.69.39	10.77.69.39
41	10.77.69.40/32	10.77.69.40 – 10.77.69.40	10.77.69.40
42	10.77.69.41/32	10.77.69.41 – 10.77.69.41	10.77.69.41
43	10.77.69.42/32	10.77.69.42 – 10.77.69.42	10.77.69.42
44	10.77.69.43/32	10.77.69.43 – 10.77.69.43	10.77.69.43
45	10.77.69.44/32	10.77.69.44 – 10.77.69.44	10.77.69.44
46	10.77.69.45/32	10.77.69.45 – 10.77.69.45	10.77.69.45
47	10.77.69.46/32	10.77.69.46 – 10.77.69.46	10.77.69.46
48	10.77.69.47/32	10.77.69.47 – 10.77.69.47	10.77.69.47
49	10.77.69.48/32	10.77.69.48 – 10.77.69.48	10.77.69.48
50	10.77.69.49/32	10.77.69.49 – 10.77.69.49	10.77.69.49
51	10.77.69.50/32	10.77.69.50 – 10.77.69.50	10.77.69.50
52	10.77.69.51/32	10.77.69.51 – 10.77.69.51	10.77.69.51
53	10.77.69.52/32	10.77.69.52 – 10.77.69.52	10.77.69.52
54	10.77.69.53/32	10.77.69.53 – 10.77.69.53	10.77.69.53
55	10.77.69.54/32	10.77.69.54 – 10.77.69.54	10.77.69.54
56	10.77.69.55/32	10.77.69.55 – 10.77.69.55	10.77.69.55
57	10.77.69.56/32	10.77.69.56 – 10.77.69.56	10.77.69.56
58	10.77.69.57/32	10.77.69.57 – 10.77.69.57	10.77.69.57
59	10.77.69.58/32	10.77.69.58 – 10.77.69.58	10.77.69.58
60	10.77.69.59/32	10.77.69.59 – 10.77.69.59	10.77.69.59
61	10.77.69.60/32	10.77.69.60 – 10.77.69.60	10.77.69.60
62	10.77.69.61/32	10.77.69.61 – 10.77.69.61	10.77.69.61
63	10.77.69.62/32	10.77.69.62 – 10.77.69.62	10.77.69.62
64	10.77.69.63/32	10.77.69.63 – 10.77.69.63	10.77.69.63
65	10.77.69.64/32	10.77.69.64 – 10.77.69.64	10.77.69.64
66	10.77.69.65/32	10.77.69.65 – 10.77.69.65	10.77.69.65
67	10.77.69.66/32	10.77.69.66 – 10.77.69.66	10.77.69.66
68	10.77.69.67/32	10.77.69.67 – 10.77.69.67	10.77.69.67
69	10.77.69.68/32	10.77.69.68 – 10.77.69.68	10.77.69.68
70	10.77.69.69/32	10.77.69.69 – 10.77.69.69	10.77.69.69
71	10.77.69.70/32	10.77.69.70 – 10.77.69.70	10.77.69.70
72	10.77.69.71/32	10.77.69.71 – 10.77.69.71	10.77.69.71
73	10.77.69.72/32	10.77.69.72 – 10.77.69.72	10.77.69.72
74	10.77.69.73/32	10.77.69.73 – 10.77.69.73	10.77.69.73
75	10.77.69.74/32	10.77.69.74 – 10.77.69.74	10.77.69.74
76	10.77.69.75/32	10.77.69.75 – 10.77.69.75	10.77.69.75
77	10.77.69.76/32	10.77.69.76 – 10.77.69.76	10.77.69.76
78	10.77.69.77/32	10.77.69.77 – 10.77.69.77	10.77.69.77
79	10.77.69.78/32	10.77.69.78 – 10.77.69.78	10.77.69.78
80	10.77.69.79/32	10.77.69.79 – 10.77.69.79	10.77.69.79
81	10.77.69.80/32	10.77.69.80 – 10.77.69.80	10.77.69.80
82	10.77.69.81/32	10.77.69.81 – 10.77.69.81	10.77.69.81
83	10.77.69.82/32	10.77.69.82 – 10.77.69.82	10.77.69.82
84	10.77.69.83/32	10.77.69.83 – 10.77.69.83	10.77.69.83
85	10.77.69.84/32	10.77.69.84 – 10.77.69.84	10.77.69.84
86	10.77.69.85/32	10.77.69.85 – 10.77.69.85	10.77.69.85
87	10.77.69.86/32	10.77.69.86 – 10.77.69.86	10.77.69.86
88	10.77.69.87/32	10.77.69.87 – 10.77.69.87	10.77.69.87
89	10.77.69.88/32	10.77.69.88 – 10.77.69.88	10.77.69.88
90	10.77.69.89/32	10.77.69.89 – 10.77.69.89	10.77.69.89
91	10.77.69.90/32	10.77.69.90 – 10.77.69.90	10.77.69.90
92	10.77.69.91/32	10.77.69.91 – 10.77.69.91	10.77.69.91
93	10.77.69.92/32	10.77.69.92 – 10.77.69.92	10.77.69.92
94	10.77.69.93/32	10.77.69.93 – 10.77.69.93	10.77.69.93
95	10.77.69.94/32	10.77.69.94 – 10.77.69.94	10.77.69.94
96	10.77.69.95/32	10.77.69.95 – 10.77.69.95	10.77.69.95
97	10.77.69.96/32	10.77.69.96 – 10.77.69.96	10.77.69.96
98	10.77.69.97/32	10.77.69.97 – 10.77.69.97	10.77.69.97
99	10.77.69.98/32	10.77.69.98 – 10.77.69.98	10.77.69.98
100	10.77.69.99/32	10.77.69.99 – 10.77.69.99	10.77.69.99
101	10.77.69.100/32	10.77.69.100 – 10.77.69.100	10.77.69.100
102	10.77.69.101/32	10.77.69.101 – 10.77.69.101	10.77.69.101
103	10.77.69.102/32	10.77.69.102 – 10.77.69.102	10.77.69.102
104	10.77.69.103/32	10.77.69.103 – 10.77.69.103	10.77.69.103
105	10.77.69.104/32	10.77.69.104 – 10.77.69.104	10.77.69.104
106	10.77.69.105/32	10.77.69.105 – 10.77.69.105	10.77.69.105
107	10.77.69.106/32	10.77.69.106 – 10.77.69.106	10.77.69.106
108	10.77.69.107/32	10.77.69.107 – 10.77.69.107	10.77.69.107
109	10.77.69.108/32	10.77.69.108 – 10.77.69.108	10.77.69.108
110	10.77.69.109/32	10.77.69.109 – 10.77.69.109	10.77.69.109
111	10.77.69.110/32	10.77.69.110 – 10.77.69.110	10.77.69.110
112	10.77.69.111/32	10.77.69.111 – 10.77.69.111	10.77.69.111
113	10.77.69.112/32	10.77.69.112 – 10.77.69.112	10.77.69.112
114	10.77.69.113/32	10.77.69.113 – 10.77.69.113	10.77.69.113
115	10.77.69.114/32	10.77.69.114 – 10.77.69.114	10.77.69.114
116	10.77.69.115/32	10.77.69.115 – 10.77.69.115	10.77.69.115
117	10.77.69.116/32	10.77.69.116 – 10.77.69.116	10.77.69.116
118	10.77.69.117/32	10.77.69.117 – 10.77.69.117	10.77.69.117
119	10.77.69.118/32	10.77.69.118 – 10.77.69.118	10.77.69.118
120	10.77.69.119/32	10.77.69.119 – 10.77.69.119	10.77.69.119
121	10.77.69.120/32	10.77.69.120 – 10.77.69.120	10.77.69.120
122	10.77.69.121/32	10.77.69.121 – 10.77.69.121	10.77.69.121
123	10.77.69.122/32	10.77.69.122 – 10.77.69.122	10.77.69.122
124	10.77.69.123/32	10.77.69.123 – 10.77.69.123	10.77.69.123
125	10.77.69.124/32	10.77.69.124 – 10.77.69.124	10.77.69.124
126	10.77.69.125/32	10.77.69.125 – 10.77.69.125	10.77.69.125
127	10.77.69.126/32	10.77.69.126 – 10.77.69.126	10.77.69.126
128	10.77.69.127/32	10.77.69.127 – 10.77.69.127	10.77.69.127
129	10.77.69.128/32	10.77.69.128 – 10.77.69.128	10.77.69.128
130	10.77.69.129/32	10.77.69.129 – 10.77.69.129	10.77.69.129
131	10.77.69.130/32	10.77.69.130 – 10.77.69.130	10.77.69.130
132	10.77.69.131/32	10.77.69.131 – 10.77.69.131	10.77.69.131
133	10.77.69.132/32	10.77.69.132 – 10.77.69.132	10.77.69.132
134	10.77.69.133/32	10.77.69.133 – 10.77.69.133	10.77.69.133
135	10.77.69.134/32	10.77.69.134 – 10.77.69.134	10.77.69.134
136	10.77.69.135/32	10.77.69.135 – 10.77.69.135	10.77.69.135
137	10.77.69.136/32	10.77.69.136 – 10.77.69.136	10.77.69.136
138	10.77.69.137/32	10.77.69.137 – 10.77.69.137	10.77.69.137
139	10.77.69.138/32	10.77.69.138 – 10.77.69.138	10.77.69.138
140	10.77.69.139/32	10.77.69.139 – 10.77.69.139	10.77.69.139
141	10.77.69.140/32	10.77.69.140 – 10.77.69.140	10.77.69.140
142	10.77.69.141/32	10.77.69.141 – 10.77.69.141	10.77.69.141
143	10.77.69.142/32	10.77.69.142 – 10.77.69.142	10.77.69.142
144	10.77.69.143/32	10.77.69.143 – 10.77.69.143	10.77.69.143
145	10.77.69.144/32	10.77.69.144 – 10.77.69.144	10.77.69.144
146	10.77.69.145/32	10.77.69.145 – 10.77.69.145	10.77.69.145
147	10.77.69.146/32	10.77.69.146 – 10.77.69.146	10.77.69.146
148	10.77.69.147/32	10.77.69.147 – 10.77.69.147	10.77.69.147
149	10.77.69.148/32	10.77.69.148 – 10.77.69.148	10.77.69.148
150	10.77.69.149/32	10.77.69.149 – 10.77.69.149	10.77.69.149
151	10.77.69.150/32	10.77.69.150 – 10.77.69.150	10.77.69.150
152	10.77.69.151/32	10.77.69.151 – 10.77.69.151	10.77.69.151
153	10.77.69.152/32	10.77.69.152 – 10.77.69.152	10.77.69.152
154	10.77.69.153/32	10.77.69.153 – 10.77.69.153	10.77.69.153
155	10.77.69.154/32	10.77.69.154 – 10.77.69.154	10.77.69.154
156	10.77.69.155/32	10.77.69.155 – 10.77.69.155	10.77.69.155
157	10.77.69.156/32	10.77.69.156 – 10.77.69.156	10.77.69.156
158	10.77.69.157/32	10.77.69.157 – 10.77.69.157	10.77.69.157
159	10.77.69.158/32	10.77.69.158 – 10.77.69.158	10.77.69.158
160	10.77.69.159/32	10.77.69.159 – 10.77.69.159	10.77.69.159
161	10.77.69.160/32	10.77.69.160 – 10.77.69.160	10.77.69.160
162	10.77.69.161/32	10.77.69.161 – 10.77.69.161	10.77.69.161
163	10.77.69.162/32	10.77.69.162 – 10.77.69.162	10.77.69.162
164	10.77.69.163/32	10.77.69.163 – 10.77.69.163	10.77.69.163
165	10.77.69.164/32	10.77.69.164 – 10.77.69.164	10.77.69.164
166	10.77.69.165/32	10.77.69.165 – 10.77.69.165	10.77.69.165
167	10.77.69.166/32	10.77.69.166 – 10.77.69.166	10.77.69.166
168	10.77.69.167/32	10.77.69.167 – 10.77.69.167	10.77.69.167
169	10.77.69.168/32	10.77.69.168 – 10.77.69.168	10.77.69.168
170	10.77.69.169/32	10.77.69.169 – 10.77.69.169	10.77.69.169
171	10.77.69.170/32	10.77.69.170 – 10.77.69.170	10.77.69.170
172	10.77.69.171/32	10.77.69.171 – 10.77.69.171	10.77.69.171
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174	10.77.69.173/32	10.77.69.173 – 10.77.69.173	10.77.69.173
175	10.77.69.174/32	10.77.69.174 – 10.77.69.174	10.77.69.174
176	10.77.69.175/32	10.77.69.175 – 10.77.69.175	10.77.69.175
177	10.77.69.176/32	10.77.69.176 – 10.77.69.176	10.77.69.176
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179	10.77.69.178/32	10.77.69.178 – 10.77.69.178	10.77.69.178
180	10.77.69.179/32	10.77.69.179 – 10.77.69.179	10.77.69.179
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198	10.77.69.197/32	10.77.69.197 – 10.77.69.197	10.77.69.197
199	10.77.69.198/32	10.77.69.198 – 10.77.69.198	10.77.69.198
200	10.77.69.199/32	10.77.69.199 – 10.77.69.199	10.77.69.199
201	10.77.69.200/32	10.77.69.200 – 10.77.69.200	10.77.69.200
202	10.77.69.201/32	10.77.69.201 – 10.77.69.201	10.77.69.201
203	10.77.69.202/32	10.77.69.202 – 10.77.69.202	10.77.69.202
204	10.77.69.203/32	10.77.69.203 – 10.77.69.203	10.77.69.203
205	10.77.69.204/32	10.77.69.204 – 10.77.69.204	10.77.69.204
206	10.77.69.205/32	10.77.69.205 – 10.77.69.205	10.77.69.205
207	10.77.69.206/32	10.77.69.206 – 10.77.69.206	10.77.69.206
208	10.77.69.207/32	10.77.69.207 – 10.77.69.207	10.77.69.207
209	10.77.69.208/32	10.77.69.208 – 10.77.69.208	10.77.69.208
210	10.77.69.209/32	10.77.69.209 – 10.77.69.209	10.77.69.209
211	10.77.69.210/32	10.77.69.210 – 10.77.69.210	10.77.69.210
212	10.77.69.211/32	10.77.69.211 – 10.77.69.211	10.77.69.211
213	10.77.69.212/32	10.77.69.212 – 10.77.69.212	10.77.69.212
214	10.77.69.213/32	10.77.69.213 – 10.77.69.213	10.77.69.213
215	10.77.69.214/32	10.77.69.214 – 10.77.69.214	10.77.69.214
216	10.77.69.215/32	10.77.69.215 – 10.77.69.215	10.77.69.215
217	10.77.69.216/32	10.77.69.216 – 10.77.69.216	10.77.69.216
218	10.77.69.217/32	10.77.69.217 – 10.77.69.217	10.77.69.217
219	10.77.69.218/32	10.77.69.218 – 10.77.69.218	10.77.69.218
220	10.77.69.219/32	10.77.69.219 – 10.77.69.219	10.77.69.219
221	10.77.69.220/32	10.77.69.220 – 10.77.69.220	10.77.69.220
222	10.77.69.221/32	10.77.69.221 – 10.77.69.221	10.77.69.221
223	10.77.69.222/32	10.77.69.222 – 10.77.69.222	10.77.69.222
224	10.77.69.223/32	10.77.69.223 – 10.77.69.223	10.77.69.223
225	10.77.69.224/32	10.77.69.224 – 10.77.69.224	10.77.69.224
226	10.77.69.225/32	10.77.69.225 – 10.77.69.225	10.77.69.225
227	10.77.69.226/32	10.77.69.226 – 10.77.69.226	10.77.69.226
228	10.77.69.227/32	10.77.69.227 – 10.77.69.227	10.77.69.227
229	10.77.69.228/32	10.77.69.228 – 10.77.69.228	10.77.69.228
230	10.77.69.229/32	10.77.69.229 – 10.77.69.229	10.77.69.229
231	10.77.69.230/32	10.77.69.230 – 10.77.69.230	10.77.69.230
232	10.77.69.231/32	10.77.69.231 – 10.77.69.231	10.77.69.231
233	10.77.69.232/32	10.77.69.232 – 10.77.69.232	10.77.69.232
234	10.77.69.233/32	10.77.69.233 – 10.77.69.233	10.77.69.233
235	10.77.69.234/32	10.77.69.234 – 10.77.69.234	10.77.69.234
236	10.77.69.235/32	10.77.69.235 – 10.77.69.235	10.77.69.235
237	10.77.69.236/32	10.77.69.236 – 10.77.69.236	10.77.69.236
238	10.77.69.237/32	10.77.69.237 – 10.77.69.237	10.77.69.237
239	10.77.69.238/32	10.77.69.238 – 10.77.69.238	10.77.69.238
240	10.77.69.239/32	10.77.69.239 – 10.77.69.239	10.77.69.239
241	10.77.69.240/32	10.77.69.240 – 10.77.69.240	10.77.69.240
242	10.77.69.241/32	10.77.69.241 – 10.77.69.241	10.77.69.241
243	10.77.69.242/32	10.77.69.242 – 10.77.69.242	10.77.69.242
244	10.77.69.243/32	10.77.69.243 – 10.77.69.243	10.77.69.243
245	10.77.69.244/32	10.77.69.244 – 10.77.69.244	10.77.69.244
246	10.77.69.245/32	10.77.69.245 – 10.77.69.245	10.77.69.245
247	10.77.69.246/32	10.77.69.246 – 10.77.69.246	10.77.69.246
248	10.77.69.247/32	10.77.69.247 – 10.77.69.247	10.77.69.247
249	10.77.69.248/32	10.77.69.248 – 10.77.69.248	10.77.69.248
250	10.77.69.249/32	10.77.69.249 – 10.77.69.249	10.77.69.249
251	10.77.69.250/32	10.77.69.250 – 10.77.69.250	10.77.69.250
252	10.77.69.251/32	10.77.69.251 – 10.77.69.251	10.77.69.251
253	10.77.69.252/32	10.77.69.252 – 10.77.69.252	10.77.69.252
254	10.77.69.253/32	10.77.69.253 – 10.77.69.253	10.77.69.253
255	10.77.69.254/32	10.77.69.254 – 10.77.69.254	10.77.69.254
256	10.77.69.255/32	10.77.69.255 – 10.77.69.255	10.77.69.255

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 /24
/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	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →