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)10.0.121.0/24

network10.0.121.0/24

broadcast10.0.121.255

first host10.0.121.1

last host10.0.121.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.121.0/24

address00001010.00000000.01111001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.01111001.00000000

broadcast00001010.00000000.01111001.11111111

green = network part, grey = host part

hex0x0a007900

decimal167803136

reverse dns0.121.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:7900

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.121.0/32	10.0.121.0 – 10.0.121.0	10.0.121.0
2	10.0.121.1/32	10.0.121.1 – 10.0.121.1	10.0.121.1
3	10.0.121.2/32	10.0.121.2 – 10.0.121.2	10.0.121.2
4	10.0.121.3/32	10.0.121.3 – 10.0.121.3	10.0.121.3
5	10.0.121.4/32	10.0.121.4 – 10.0.121.4	10.0.121.4
6	10.0.121.5/32	10.0.121.5 – 10.0.121.5	10.0.121.5
7	10.0.121.6/32	10.0.121.6 – 10.0.121.6	10.0.121.6
8	10.0.121.7/32	10.0.121.7 – 10.0.121.7	10.0.121.7
9	10.0.121.8/32	10.0.121.8 – 10.0.121.8	10.0.121.8
10	10.0.121.9/32	10.0.121.9 – 10.0.121.9	10.0.121.9
11	10.0.121.10/32	10.0.121.10 – 10.0.121.10	10.0.121.10
12	10.0.121.11/32	10.0.121.11 – 10.0.121.11	10.0.121.11
13	10.0.121.12/32	10.0.121.12 – 10.0.121.12	10.0.121.12
14	10.0.121.13/32	10.0.121.13 – 10.0.121.13	10.0.121.13
15	10.0.121.14/32	10.0.121.14 – 10.0.121.14	10.0.121.14
16	10.0.121.15/32	10.0.121.15 – 10.0.121.15	10.0.121.15
17	10.0.121.16/32	10.0.121.16 – 10.0.121.16	10.0.121.16
18	10.0.121.17/32	10.0.121.17 – 10.0.121.17	10.0.121.17
19	10.0.121.18/32	10.0.121.18 – 10.0.121.18	10.0.121.18
20	10.0.121.19/32	10.0.121.19 – 10.0.121.19	10.0.121.19
21	10.0.121.20/32	10.0.121.20 – 10.0.121.20	10.0.121.20
22	10.0.121.21/32	10.0.121.21 – 10.0.121.21	10.0.121.21
23	10.0.121.22/32	10.0.121.22 – 10.0.121.22	10.0.121.22
24	10.0.121.23/32	10.0.121.23 – 10.0.121.23	10.0.121.23
25	10.0.121.24/32	10.0.121.24 – 10.0.121.24	10.0.121.24
26	10.0.121.25/32	10.0.121.25 – 10.0.121.25	10.0.121.25
27	10.0.121.26/32	10.0.121.26 – 10.0.121.26	10.0.121.26
28	10.0.121.27/32	10.0.121.27 – 10.0.121.27	10.0.121.27
29	10.0.121.28/32	10.0.121.28 – 10.0.121.28	10.0.121.28
30	10.0.121.29/32	10.0.121.29 – 10.0.121.29	10.0.121.29
31	10.0.121.30/32	10.0.121.30 – 10.0.121.30	10.0.121.30
32	10.0.121.31/32	10.0.121.31 – 10.0.121.31	10.0.121.31
33	10.0.121.32/32	10.0.121.32 – 10.0.121.32	10.0.121.32
34	10.0.121.33/32	10.0.121.33 – 10.0.121.33	10.0.121.33
35	10.0.121.34/32	10.0.121.34 – 10.0.121.34	10.0.121.34
36	10.0.121.35/32	10.0.121.35 – 10.0.121.35	10.0.121.35
37	10.0.121.36/32	10.0.121.36 – 10.0.121.36	10.0.121.36
38	10.0.121.37/32	10.0.121.37 – 10.0.121.37	10.0.121.37
39	10.0.121.38/32	10.0.121.38 – 10.0.121.38	10.0.121.38
40	10.0.121.39/32	10.0.121.39 – 10.0.121.39	10.0.121.39
41	10.0.121.40/32	10.0.121.40 – 10.0.121.40	10.0.121.40
42	10.0.121.41/32	10.0.121.41 – 10.0.121.41	10.0.121.41
43	10.0.121.42/32	10.0.121.42 – 10.0.121.42	10.0.121.42
44	10.0.121.43/32	10.0.121.43 – 10.0.121.43	10.0.121.43
45	10.0.121.44/32	10.0.121.44 – 10.0.121.44	10.0.121.44
46	10.0.121.45/32	10.0.121.45 – 10.0.121.45	10.0.121.45
47	10.0.121.46/32	10.0.121.46 – 10.0.121.46	10.0.121.46
48	10.0.121.47/32	10.0.121.47 – 10.0.121.47	10.0.121.47
49	10.0.121.48/32	10.0.121.48 – 10.0.121.48	10.0.121.48
50	10.0.121.49/32	10.0.121.49 – 10.0.121.49	10.0.121.49
51	10.0.121.50/32	10.0.121.50 – 10.0.121.50	10.0.121.50
52	10.0.121.51/32	10.0.121.51 – 10.0.121.51	10.0.121.51
53	10.0.121.52/32	10.0.121.52 – 10.0.121.52	10.0.121.52
54	10.0.121.53/32	10.0.121.53 – 10.0.121.53	10.0.121.53
55	10.0.121.54/32	10.0.121.54 – 10.0.121.54	10.0.121.54
56	10.0.121.55/32	10.0.121.55 – 10.0.121.55	10.0.121.55
57	10.0.121.56/32	10.0.121.56 – 10.0.121.56	10.0.121.56
58	10.0.121.57/32	10.0.121.57 – 10.0.121.57	10.0.121.57
59	10.0.121.58/32	10.0.121.58 – 10.0.121.58	10.0.121.58
60	10.0.121.59/32	10.0.121.59 – 10.0.121.59	10.0.121.59
61	10.0.121.60/32	10.0.121.60 – 10.0.121.60	10.0.121.60
62	10.0.121.61/32	10.0.121.61 – 10.0.121.61	10.0.121.61
63	10.0.121.62/32	10.0.121.62 – 10.0.121.62	10.0.121.62
64	10.0.121.63/32	10.0.121.63 – 10.0.121.63	10.0.121.63
65	10.0.121.64/32	10.0.121.64 – 10.0.121.64	10.0.121.64
66	10.0.121.65/32	10.0.121.65 – 10.0.121.65	10.0.121.65
67	10.0.121.66/32	10.0.121.66 – 10.0.121.66	10.0.121.66
68	10.0.121.67/32	10.0.121.67 – 10.0.121.67	10.0.121.67
69	10.0.121.68/32	10.0.121.68 – 10.0.121.68	10.0.121.68
70	10.0.121.69/32	10.0.121.69 – 10.0.121.69	10.0.121.69
71	10.0.121.70/32	10.0.121.70 – 10.0.121.70	10.0.121.70
72	10.0.121.71/32	10.0.121.71 – 10.0.121.71	10.0.121.71
73	10.0.121.72/32	10.0.121.72 – 10.0.121.72	10.0.121.72
74	10.0.121.73/32	10.0.121.73 – 10.0.121.73	10.0.121.73
75	10.0.121.74/32	10.0.121.74 – 10.0.121.74	10.0.121.74
76	10.0.121.75/32	10.0.121.75 – 10.0.121.75	10.0.121.75
77	10.0.121.76/32	10.0.121.76 – 10.0.121.76	10.0.121.76
78	10.0.121.77/32	10.0.121.77 – 10.0.121.77	10.0.121.77
79	10.0.121.78/32	10.0.121.78 – 10.0.121.78	10.0.121.78
80	10.0.121.79/32	10.0.121.79 – 10.0.121.79	10.0.121.79
81	10.0.121.80/32	10.0.121.80 – 10.0.121.80	10.0.121.80
82	10.0.121.81/32	10.0.121.81 – 10.0.121.81	10.0.121.81
83	10.0.121.82/32	10.0.121.82 – 10.0.121.82	10.0.121.82
84	10.0.121.83/32	10.0.121.83 – 10.0.121.83	10.0.121.83
85	10.0.121.84/32	10.0.121.84 – 10.0.121.84	10.0.121.84
86	10.0.121.85/32	10.0.121.85 – 10.0.121.85	10.0.121.85
87	10.0.121.86/32	10.0.121.86 – 10.0.121.86	10.0.121.86
88	10.0.121.87/32	10.0.121.87 – 10.0.121.87	10.0.121.87
89	10.0.121.88/32	10.0.121.88 – 10.0.121.88	10.0.121.88
90	10.0.121.89/32	10.0.121.89 – 10.0.121.89	10.0.121.89
91	10.0.121.90/32	10.0.121.90 – 10.0.121.90	10.0.121.90
92	10.0.121.91/32	10.0.121.91 – 10.0.121.91	10.0.121.91
93	10.0.121.92/32	10.0.121.92 – 10.0.121.92	10.0.121.92
94	10.0.121.93/32	10.0.121.93 – 10.0.121.93	10.0.121.93
95	10.0.121.94/32	10.0.121.94 – 10.0.121.94	10.0.121.94
96	10.0.121.95/32	10.0.121.95 – 10.0.121.95	10.0.121.95
97	10.0.121.96/32	10.0.121.96 – 10.0.121.96	10.0.121.96
98	10.0.121.97/32	10.0.121.97 – 10.0.121.97	10.0.121.97
99	10.0.121.98/32	10.0.121.98 – 10.0.121.98	10.0.121.98
100	10.0.121.99/32	10.0.121.99 – 10.0.121.99	10.0.121.99
101	10.0.121.100/32	10.0.121.100 – 10.0.121.100	10.0.121.100
102	10.0.121.101/32	10.0.121.101 – 10.0.121.101	10.0.121.101
103	10.0.121.102/32	10.0.121.102 – 10.0.121.102	10.0.121.102
104	10.0.121.103/32	10.0.121.103 – 10.0.121.103	10.0.121.103
105	10.0.121.104/32	10.0.121.104 – 10.0.121.104	10.0.121.104
106	10.0.121.105/32	10.0.121.105 – 10.0.121.105	10.0.121.105
107	10.0.121.106/32	10.0.121.106 – 10.0.121.106	10.0.121.106
108	10.0.121.107/32	10.0.121.107 – 10.0.121.107	10.0.121.107
109	10.0.121.108/32	10.0.121.108 – 10.0.121.108	10.0.121.108
110	10.0.121.109/32	10.0.121.109 – 10.0.121.109	10.0.121.109
111	10.0.121.110/32	10.0.121.110 – 10.0.121.110	10.0.121.110
112	10.0.121.111/32	10.0.121.111 – 10.0.121.111	10.0.121.111
113	10.0.121.112/32	10.0.121.112 – 10.0.121.112	10.0.121.112
114	10.0.121.113/32	10.0.121.113 – 10.0.121.113	10.0.121.113
115	10.0.121.114/32	10.0.121.114 – 10.0.121.114	10.0.121.114
116	10.0.121.115/32	10.0.121.115 – 10.0.121.115	10.0.121.115
117	10.0.121.116/32	10.0.121.116 – 10.0.121.116	10.0.121.116
118	10.0.121.117/32	10.0.121.117 – 10.0.121.117	10.0.121.117
119	10.0.121.118/32	10.0.121.118 – 10.0.121.118	10.0.121.118
120	10.0.121.119/32	10.0.121.119 – 10.0.121.119	10.0.121.119
121	10.0.121.120/32	10.0.121.120 – 10.0.121.120	10.0.121.120
122	10.0.121.121/32	10.0.121.121 – 10.0.121.121	10.0.121.121
123	10.0.121.122/32	10.0.121.122 – 10.0.121.122	10.0.121.122
124	10.0.121.123/32	10.0.121.123 – 10.0.121.123	10.0.121.123
125	10.0.121.124/32	10.0.121.124 – 10.0.121.124	10.0.121.124
126	10.0.121.125/32	10.0.121.125 – 10.0.121.125	10.0.121.125
127	10.0.121.126/32	10.0.121.126 – 10.0.121.126	10.0.121.126
128	10.0.121.127/32	10.0.121.127 – 10.0.121.127	10.0.121.127
129	10.0.121.128/32	10.0.121.128 – 10.0.121.128	10.0.121.128
130	10.0.121.129/32	10.0.121.129 – 10.0.121.129	10.0.121.129
131	10.0.121.130/32	10.0.121.130 – 10.0.121.130	10.0.121.130
132	10.0.121.131/32	10.0.121.131 – 10.0.121.131	10.0.121.131
133	10.0.121.132/32	10.0.121.132 – 10.0.121.132	10.0.121.132
134	10.0.121.133/32	10.0.121.133 – 10.0.121.133	10.0.121.133
135	10.0.121.134/32	10.0.121.134 – 10.0.121.134	10.0.121.134
136	10.0.121.135/32	10.0.121.135 – 10.0.121.135	10.0.121.135
137	10.0.121.136/32	10.0.121.136 – 10.0.121.136	10.0.121.136
138	10.0.121.137/32	10.0.121.137 – 10.0.121.137	10.0.121.137
139	10.0.121.138/32	10.0.121.138 – 10.0.121.138	10.0.121.138
140	10.0.121.139/32	10.0.121.139 – 10.0.121.139	10.0.121.139
141	10.0.121.140/32	10.0.121.140 – 10.0.121.140	10.0.121.140
142	10.0.121.141/32	10.0.121.141 – 10.0.121.141	10.0.121.141
143	10.0.121.142/32	10.0.121.142 – 10.0.121.142	10.0.121.142
144	10.0.121.143/32	10.0.121.143 – 10.0.121.143	10.0.121.143
145	10.0.121.144/32	10.0.121.144 – 10.0.121.144	10.0.121.144
146	10.0.121.145/32	10.0.121.145 – 10.0.121.145	10.0.121.145
147	10.0.121.146/32	10.0.121.146 – 10.0.121.146	10.0.121.146
148	10.0.121.147/32	10.0.121.147 – 10.0.121.147	10.0.121.147
149	10.0.121.148/32	10.0.121.148 – 10.0.121.148	10.0.121.148
150	10.0.121.149/32	10.0.121.149 – 10.0.121.149	10.0.121.149
151	10.0.121.150/32	10.0.121.150 – 10.0.121.150	10.0.121.150
152	10.0.121.151/32	10.0.121.151 – 10.0.121.151	10.0.121.151
153	10.0.121.152/32	10.0.121.152 – 10.0.121.152	10.0.121.152
154	10.0.121.153/32	10.0.121.153 – 10.0.121.153	10.0.121.153
155	10.0.121.154/32	10.0.121.154 – 10.0.121.154	10.0.121.154
156	10.0.121.155/32	10.0.121.155 – 10.0.121.155	10.0.121.155
157	10.0.121.156/32	10.0.121.156 – 10.0.121.156	10.0.121.156
158	10.0.121.157/32	10.0.121.157 – 10.0.121.157	10.0.121.157
159	10.0.121.158/32	10.0.121.158 – 10.0.121.158	10.0.121.158
160	10.0.121.159/32	10.0.121.159 – 10.0.121.159	10.0.121.159
161	10.0.121.160/32	10.0.121.160 – 10.0.121.160	10.0.121.160
162	10.0.121.161/32	10.0.121.161 – 10.0.121.161	10.0.121.161
163	10.0.121.162/32	10.0.121.162 – 10.0.121.162	10.0.121.162
164	10.0.121.163/32	10.0.121.163 – 10.0.121.163	10.0.121.163
165	10.0.121.164/32	10.0.121.164 – 10.0.121.164	10.0.121.164
166	10.0.121.165/32	10.0.121.165 – 10.0.121.165	10.0.121.165
167	10.0.121.166/32	10.0.121.166 – 10.0.121.166	10.0.121.166
168	10.0.121.167/32	10.0.121.167 – 10.0.121.167	10.0.121.167
169	10.0.121.168/32	10.0.121.168 – 10.0.121.168	10.0.121.168
170	10.0.121.169/32	10.0.121.169 – 10.0.121.169	10.0.121.169
171	10.0.121.170/32	10.0.121.170 – 10.0.121.170	10.0.121.170
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210	10.0.121.209/32	10.0.121.209 – 10.0.121.209	10.0.121.209
211	10.0.121.210/32	10.0.121.210 – 10.0.121.210	10.0.121.210
212	10.0.121.211/32	10.0.121.211 – 10.0.121.211	10.0.121.211
213	10.0.121.212/32	10.0.121.212 – 10.0.121.212	10.0.121.212
214	10.0.121.213/32	10.0.121.213 – 10.0.121.213	10.0.121.213
215	10.0.121.214/32	10.0.121.214 – 10.0.121.214	10.0.121.214
216	10.0.121.215/32	10.0.121.215 – 10.0.121.215	10.0.121.215
217	10.0.121.216/32	10.0.121.216 – 10.0.121.216	10.0.121.216
218	10.0.121.217/32	10.0.121.217 – 10.0.121.217	10.0.121.217
219	10.0.121.218/32	10.0.121.218 – 10.0.121.218	10.0.121.218
220	10.0.121.219/32	10.0.121.219 – 10.0.121.219	10.0.121.219
221	10.0.121.220/32	10.0.121.220 – 10.0.121.220	10.0.121.220
222	10.0.121.221/32	10.0.121.221 – 10.0.121.221	10.0.121.221
223	10.0.121.222/32	10.0.121.222 – 10.0.121.222	10.0.121.222
224	10.0.121.223/32	10.0.121.223 – 10.0.121.223	10.0.121.223
225	10.0.121.224/32	10.0.121.224 – 10.0.121.224	10.0.121.224
226	10.0.121.225/32	10.0.121.225 – 10.0.121.225	10.0.121.225
227	10.0.121.226/32	10.0.121.226 – 10.0.121.226	10.0.121.226
228	10.0.121.227/32	10.0.121.227 – 10.0.121.227	10.0.121.227
229	10.0.121.228/32	10.0.121.228 – 10.0.121.228	10.0.121.228
230	10.0.121.229/32	10.0.121.229 – 10.0.121.229	10.0.121.229
231	10.0.121.230/32	10.0.121.230 – 10.0.121.230	10.0.121.230
232	10.0.121.231/32	10.0.121.231 – 10.0.121.231	10.0.121.231
233	10.0.121.232/32	10.0.121.232 – 10.0.121.232	10.0.121.232
234	10.0.121.233/32	10.0.121.233 – 10.0.121.233	10.0.121.233
235	10.0.121.234/32	10.0.121.234 – 10.0.121.234	10.0.121.234
236	10.0.121.235/32	10.0.121.235 – 10.0.121.235	10.0.121.235
237	10.0.121.236/32	10.0.121.236 – 10.0.121.236	10.0.121.236
238	10.0.121.237/32	10.0.121.237 – 10.0.121.237	10.0.121.237
239	10.0.121.238/32	10.0.121.238 – 10.0.121.238	10.0.121.238
240	10.0.121.239/32	10.0.121.239 – 10.0.121.239	10.0.121.239
241	10.0.121.240/32	10.0.121.240 – 10.0.121.240	10.0.121.240
242	10.0.121.241/32	10.0.121.241 – 10.0.121.241	10.0.121.241
243	10.0.121.242/32	10.0.121.242 – 10.0.121.242	10.0.121.242
244	10.0.121.243/32	10.0.121.243 – 10.0.121.243	10.0.121.243
245	10.0.121.244/32	10.0.121.244 – 10.0.121.244	10.0.121.244
246	10.0.121.245/32	10.0.121.245 – 10.0.121.245	10.0.121.245
247	10.0.121.246/32	10.0.121.246 – 10.0.121.246	10.0.121.246
248	10.0.121.247/32	10.0.121.247 – 10.0.121.247	10.0.121.247
249	10.0.121.248/32	10.0.121.248 – 10.0.121.248	10.0.121.248
250	10.0.121.249/32	10.0.121.249 – 10.0.121.249	10.0.121.249
251	10.0.121.250/32	10.0.121.250 – 10.0.121.250	10.0.121.250
252	10.0.121.251/32	10.0.121.251 – 10.0.121.251	10.0.121.251
253	10.0.121.252/32	10.0.121.252 – 10.0.121.252	10.0.121.252
254	10.0.121.253/32	10.0.121.253 – 10.0.121.253	10.0.121.253
255	10.0.121.254/32	10.0.121.254 – 10.0.121.254	10.0.121.254
256	10.0.121.255/32	10.0.121.255 – 10.0.121.255	10.0.121.255

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 →