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)10.3.127.0/24

network10.3.127.0/24

broadcast10.3.127.255

first host10.3.127.1

last host10.3.127.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.127.0/24

address00001010.00000011.01111111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.01111111.00000000

broadcast00001010.00000011.01111111.11111111

green = network part, grey = host part

hex0x0a037f00

decimal168001280

reverse dns0.127.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:7f00

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.127.0/32	10.3.127.0 – 10.3.127.0	10.3.127.0
2	10.3.127.1/32	10.3.127.1 – 10.3.127.1	10.3.127.1
3	10.3.127.2/32	10.3.127.2 – 10.3.127.2	10.3.127.2
4	10.3.127.3/32	10.3.127.3 – 10.3.127.3	10.3.127.3
5	10.3.127.4/32	10.3.127.4 – 10.3.127.4	10.3.127.4
6	10.3.127.5/32	10.3.127.5 – 10.3.127.5	10.3.127.5
7	10.3.127.6/32	10.3.127.6 – 10.3.127.6	10.3.127.6
8	10.3.127.7/32	10.3.127.7 – 10.3.127.7	10.3.127.7
9	10.3.127.8/32	10.3.127.8 – 10.3.127.8	10.3.127.8
10	10.3.127.9/32	10.3.127.9 – 10.3.127.9	10.3.127.9
11	10.3.127.10/32	10.3.127.10 – 10.3.127.10	10.3.127.10
12	10.3.127.11/32	10.3.127.11 – 10.3.127.11	10.3.127.11
13	10.3.127.12/32	10.3.127.12 – 10.3.127.12	10.3.127.12
14	10.3.127.13/32	10.3.127.13 – 10.3.127.13	10.3.127.13
15	10.3.127.14/32	10.3.127.14 – 10.3.127.14	10.3.127.14
16	10.3.127.15/32	10.3.127.15 – 10.3.127.15	10.3.127.15
17	10.3.127.16/32	10.3.127.16 – 10.3.127.16	10.3.127.16
18	10.3.127.17/32	10.3.127.17 – 10.3.127.17	10.3.127.17
19	10.3.127.18/32	10.3.127.18 – 10.3.127.18	10.3.127.18
20	10.3.127.19/32	10.3.127.19 – 10.3.127.19	10.3.127.19
21	10.3.127.20/32	10.3.127.20 – 10.3.127.20	10.3.127.20
22	10.3.127.21/32	10.3.127.21 – 10.3.127.21	10.3.127.21
23	10.3.127.22/32	10.3.127.22 – 10.3.127.22	10.3.127.22
24	10.3.127.23/32	10.3.127.23 – 10.3.127.23	10.3.127.23
25	10.3.127.24/32	10.3.127.24 – 10.3.127.24	10.3.127.24
26	10.3.127.25/32	10.3.127.25 – 10.3.127.25	10.3.127.25
27	10.3.127.26/32	10.3.127.26 – 10.3.127.26	10.3.127.26
28	10.3.127.27/32	10.3.127.27 – 10.3.127.27	10.3.127.27
29	10.3.127.28/32	10.3.127.28 – 10.3.127.28	10.3.127.28
30	10.3.127.29/32	10.3.127.29 – 10.3.127.29	10.3.127.29
31	10.3.127.30/32	10.3.127.30 – 10.3.127.30	10.3.127.30
32	10.3.127.31/32	10.3.127.31 – 10.3.127.31	10.3.127.31
33	10.3.127.32/32	10.3.127.32 – 10.3.127.32	10.3.127.32
34	10.3.127.33/32	10.3.127.33 – 10.3.127.33	10.3.127.33
35	10.3.127.34/32	10.3.127.34 – 10.3.127.34	10.3.127.34
36	10.3.127.35/32	10.3.127.35 – 10.3.127.35	10.3.127.35
37	10.3.127.36/32	10.3.127.36 – 10.3.127.36	10.3.127.36
38	10.3.127.37/32	10.3.127.37 – 10.3.127.37	10.3.127.37
39	10.3.127.38/32	10.3.127.38 – 10.3.127.38	10.3.127.38
40	10.3.127.39/32	10.3.127.39 – 10.3.127.39	10.3.127.39
41	10.3.127.40/32	10.3.127.40 – 10.3.127.40	10.3.127.40
42	10.3.127.41/32	10.3.127.41 – 10.3.127.41	10.3.127.41
43	10.3.127.42/32	10.3.127.42 – 10.3.127.42	10.3.127.42
44	10.3.127.43/32	10.3.127.43 – 10.3.127.43	10.3.127.43
45	10.3.127.44/32	10.3.127.44 – 10.3.127.44	10.3.127.44
46	10.3.127.45/32	10.3.127.45 – 10.3.127.45	10.3.127.45
47	10.3.127.46/32	10.3.127.46 – 10.3.127.46	10.3.127.46
48	10.3.127.47/32	10.3.127.47 – 10.3.127.47	10.3.127.47
49	10.3.127.48/32	10.3.127.48 – 10.3.127.48	10.3.127.48
50	10.3.127.49/32	10.3.127.49 – 10.3.127.49	10.3.127.49
51	10.3.127.50/32	10.3.127.50 – 10.3.127.50	10.3.127.50
52	10.3.127.51/32	10.3.127.51 – 10.3.127.51	10.3.127.51
53	10.3.127.52/32	10.3.127.52 – 10.3.127.52	10.3.127.52
54	10.3.127.53/32	10.3.127.53 – 10.3.127.53	10.3.127.53
55	10.3.127.54/32	10.3.127.54 – 10.3.127.54	10.3.127.54
56	10.3.127.55/32	10.3.127.55 – 10.3.127.55	10.3.127.55
57	10.3.127.56/32	10.3.127.56 – 10.3.127.56	10.3.127.56
58	10.3.127.57/32	10.3.127.57 – 10.3.127.57	10.3.127.57
59	10.3.127.58/32	10.3.127.58 – 10.3.127.58	10.3.127.58
60	10.3.127.59/32	10.3.127.59 – 10.3.127.59	10.3.127.59
61	10.3.127.60/32	10.3.127.60 – 10.3.127.60	10.3.127.60
62	10.3.127.61/32	10.3.127.61 – 10.3.127.61	10.3.127.61
63	10.3.127.62/32	10.3.127.62 – 10.3.127.62	10.3.127.62
64	10.3.127.63/32	10.3.127.63 – 10.3.127.63	10.3.127.63
65	10.3.127.64/32	10.3.127.64 – 10.3.127.64	10.3.127.64
66	10.3.127.65/32	10.3.127.65 – 10.3.127.65	10.3.127.65
67	10.3.127.66/32	10.3.127.66 – 10.3.127.66	10.3.127.66
68	10.3.127.67/32	10.3.127.67 – 10.3.127.67	10.3.127.67
69	10.3.127.68/32	10.3.127.68 – 10.3.127.68	10.3.127.68
70	10.3.127.69/32	10.3.127.69 – 10.3.127.69	10.3.127.69
71	10.3.127.70/32	10.3.127.70 – 10.3.127.70	10.3.127.70
72	10.3.127.71/32	10.3.127.71 – 10.3.127.71	10.3.127.71
73	10.3.127.72/32	10.3.127.72 – 10.3.127.72	10.3.127.72
74	10.3.127.73/32	10.3.127.73 – 10.3.127.73	10.3.127.73
75	10.3.127.74/32	10.3.127.74 – 10.3.127.74	10.3.127.74
76	10.3.127.75/32	10.3.127.75 – 10.3.127.75	10.3.127.75
77	10.3.127.76/32	10.3.127.76 – 10.3.127.76	10.3.127.76
78	10.3.127.77/32	10.3.127.77 – 10.3.127.77	10.3.127.77
79	10.3.127.78/32	10.3.127.78 – 10.3.127.78	10.3.127.78
80	10.3.127.79/32	10.3.127.79 – 10.3.127.79	10.3.127.79
81	10.3.127.80/32	10.3.127.80 – 10.3.127.80	10.3.127.80
82	10.3.127.81/32	10.3.127.81 – 10.3.127.81	10.3.127.81
83	10.3.127.82/32	10.3.127.82 – 10.3.127.82	10.3.127.82
84	10.3.127.83/32	10.3.127.83 – 10.3.127.83	10.3.127.83
85	10.3.127.84/32	10.3.127.84 – 10.3.127.84	10.3.127.84
86	10.3.127.85/32	10.3.127.85 – 10.3.127.85	10.3.127.85
87	10.3.127.86/32	10.3.127.86 – 10.3.127.86	10.3.127.86
88	10.3.127.87/32	10.3.127.87 – 10.3.127.87	10.3.127.87
89	10.3.127.88/32	10.3.127.88 – 10.3.127.88	10.3.127.88
90	10.3.127.89/32	10.3.127.89 – 10.3.127.89	10.3.127.89
91	10.3.127.90/32	10.3.127.90 – 10.3.127.90	10.3.127.90
92	10.3.127.91/32	10.3.127.91 – 10.3.127.91	10.3.127.91
93	10.3.127.92/32	10.3.127.92 – 10.3.127.92	10.3.127.92
94	10.3.127.93/32	10.3.127.93 – 10.3.127.93	10.3.127.93
95	10.3.127.94/32	10.3.127.94 – 10.3.127.94	10.3.127.94
96	10.3.127.95/32	10.3.127.95 – 10.3.127.95	10.3.127.95
97	10.3.127.96/32	10.3.127.96 – 10.3.127.96	10.3.127.96
98	10.3.127.97/32	10.3.127.97 – 10.3.127.97	10.3.127.97
99	10.3.127.98/32	10.3.127.98 – 10.3.127.98	10.3.127.98
100	10.3.127.99/32	10.3.127.99 – 10.3.127.99	10.3.127.99
101	10.3.127.100/32	10.3.127.100 – 10.3.127.100	10.3.127.100
102	10.3.127.101/32	10.3.127.101 – 10.3.127.101	10.3.127.101
103	10.3.127.102/32	10.3.127.102 – 10.3.127.102	10.3.127.102
104	10.3.127.103/32	10.3.127.103 – 10.3.127.103	10.3.127.103
105	10.3.127.104/32	10.3.127.104 – 10.3.127.104	10.3.127.104
106	10.3.127.105/32	10.3.127.105 – 10.3.127.105	10.3.127.105
107	10.3.127.106/32	10.3.127.106 – 10.3.127.106	10.3.127.106
108	10.3.127.107/32	10.3.127.107 – 10.3.127.107	10.3.127.107
109	10.3.127.108/32	10.3.127.108 – 10.3.127.108	10.3.127.108
110	10.3.127.109/32	10.3.127.109 – 10.3.127.109	10.3.127.109
111	10.3.127.110/32	10.3.127.110 – 10.3.127.110	10.3.127.110
112	10.3.127.111/32	10.3.127.111 – 10.3.127.111	10.3.127.111
113	10.3.127.112/32	10.3.127.112 – 10.3.127.112	10.3.127.112
114	10.3.127.113/32	10.3.127.113 – 10.3.127.113	10.3.127.113
115	10.3.127.114/32	10.3.127.114 – 10.3.127.114	10.3.127.114
116	10.3.127.115/32	10.3.127.115 – 10.3.127.115	10.3.127.115
117	10.3.127.116/32	10.3.127.116 – 10.3.127.116	10.3.127.116
118	10.3.127.117/32	10.3.127.117 – 10.3.127.117	10.3.127.117
119	10.3.127.118/32	10.3.127.118 – 10.3.127.118	10.3.127.118
120	10.3.127.119/32	10.3.127.119 – 10.3.127.119	10.3.127.119
121	10.3.127.120/32	10.3.127.120 – 10.3.127.120	10.3.127.120
122	10.3.127.121/32	10.3.127.121 – 10.3.127.121	10.3.127.121
123	10.3.127.122/32	10.3.127.122 – 10.3.127.122	10.3.127.122
124	10.3.127.123/32	10.3.127.123 – 10.3.127.123	10.3.127.123
125	10.3.127.124/32	10.3.127.124 – 10.3.127.124	10.3.127.124
126	10.3.127.125/32	10.3.127.125 – 10.3.127.125	10.3.127.125
127	10.3.127.126/32	10.3.127.126 – 10.3.127.126	10.3.127.126
128	10.3.127.127/32	10.3.127.127 – 10.3.127.127	10.3.127.127
129	10.3.127.128/32	10.3.127.128 – 10.3.127.128	10.3.127.128
130	10.3.127.129/32	10.3.127.129 – 10.3.127.129	10.3.127.129
131	10.3.127.130/32	10.3.127.130 – 10.3.127.130	10.3.127.130
132	10.3.127.131/32	10.3.127.131 – 10.3.127.131	10.3.127.131
133	10.3.127.132/32	10.3.127.132 – 10.3.127.132	10.3.127.132
134	10.3.127.133/32	10.3.127.133 – 10.3.127.133	10.3.127.133
135	10.3.127.134/32	10.3.127.134 – 10.3.127.134	10.3.127.134
136	10.3.127.135/32	10.3.127.135 – 10.3.127.135	10.3.127.135
137	10.3.127.136/32	10.3.127.136 – 10.3.127.136	10.3.127.136
138	10.3.127.137/32	10.3.127.137 – 10.3.127.137	10.3.127.137
139	10.3.127.138/32	10.3.127.138 – 10.3.127.138	10.3.127.138
140	10.3.127.139/32	10.3.127.139 – 10.3.127.139	10.3.127.139
141	10.3.127.140/32	10.3.127.140 – 10.3.127.140	10.3.127.140
142	10.3.127.141/32	10.3.127.141 – 10.3.127.141	10.3.127.141
143	10.3.127.142/32	10.3.127.142 – 10.3.127.142	10.3.127.142
144	10.3.127.143/32	10.3.127.143 – 10.3.127.143	10.3.127.143
145	10.3.127.144/32	10.3.127.144 – 10.3.127.144	10.3.127.144
146	10.3.127.145/32	10.3.127.145 – 10.3.127.145	10.3.127.145
147	10.3.127.146/32	10.3.127.146 – 10.3.127.146	10.3.127.146
148	10.3.127.147/32	10.3.127.147 – 10.3.127.147	10.3.127.147
149	10.3.127.148/32	10.3.127.148 – 10.3.127.148	10.3.127.148
150	10.3.127.149/32	10.3.127.149 – 10.3.127.149	10.3.127.149
151	10.3.127.150/32	10.3.127.150 – 10.3.127.150	10.3.127.150
152	10.3.127.151/32	10.3.127.151 – 10.3.127.151	10.3.127.151
153	10.3.127.152/32	10.3.127.152 – 10.3.127.152	10.3.127.152
154	10.3.127.153/32	10.3.127.153 – 10.3.127.153	10.3.127.153
155	10.3.127.154/32	10.3.127.154 – 10.3.127.154	10.3.127.154
156	10.3.127.155/32	10.3.127.155 – 10.3.127.155	10.3.127.155
157	10.3.127.156/32	10.3.127.156 – 10.3.127.156	10.3.127.156
158	10.3.127.157/32	10.3.127.157 – 10.3.127.157	10.3.127.157
159	10.3.127.158/32	10.3.127.158 – 10.3.127.158	10.3.127.158
160	10.3.127.159/32	10.3.127.159 – 10.3.127.159	10.3.127.159
161	10.3.127.160/32	10.3.127.160 – 10.3.127.160	10.3.127.160
162	10.3.127.161/32	10.3.127.161 – 10.3.127.161	10.3.127.161
163	10.3.127.162/32	10.3.127.162 – 10.3.127.162	10.3.127.162
164	10.3.127.163/32	10.3.127.163 – 10.3.127.163	10.3.127.163
165	10.3.127.164/32	10.3.127.164 – 10.3.127.164	10.3.127.164
166	10.3.127.165/32	10.3.127.165 – 10.3.127.165	10.3.127.165
167	10.3.127.166/32	10.3.127.166 – 10.3.127.166	10.3.127.166
168	10.3.127.167/32	10.3.127.167 – 10.3.127.167	10.3.127.167
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170	10.3.127.169/32	10.3.127.169 – 10.3.127.169	10.3.127.169
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210	10.3.127.209/32	10.3.127.209 – 10.3.127.209	10.3.127.209
211	10.3.127.210/32	10.3.127.210 – 10.3.127.210	10.3.127.210
212	10.3.127.211/32	10.3.127.211 – 10.3.127.211	10.3.127.211
213	10.3.127.212/32	10.3.127.212 – 10.3.127.212	10.3.127.212
214	10.3.127.213/32	10.3.127.213 – 10.3.127.213	10.3.127.213
215	10.3.127.214/32	10.3.127.214 – 10.3.127.214	10.3.127.214
216	10.3.127.215/32	10.3.127.215 – 10.3.127.215	10.3.127.215
217	10.3.127.216/32	10.3.127.216 – 10.3.127.216	10.3.127.216
218	10.3.127.217/32	10.3.127.217 – 10.3.127.217	10.3.127.217
219	10.3.127.218/32	10.3.127.218 – 10.3.127.218	10.3.127.218
220	10.3.127.219/32	10.3.127.219 – 10.3.127.219	10.3.127.219
221	10.3.127.220/32	10.3.127.220 – 10.3.127.220	10.3.127.220
222	10.3.127.221/32	10.3.127.221 – 10.3.127.221	10.3.127.221
223	10.3.127.222/32	10.3.127.222 – 10.3.127.222	10.3.127.222
224	10.3.127.223/32	10.3.127.223 – 10.3.127.223	10.3.127.223
225	10.3.127.224/32	10.3.127.224 – 10.3.127.224	10.3.127.224
226	10.3.127.225/32	10.3.127.225 – 10.3.127.225	10.3.127.225
227	10.3.127.226/32	10.3.127.226 – 10.3.127.226	10.3.127.226
228	10.3.127.227/32	10.3.127.227 – 10.3.127.227	10.3.127.227
229	10.3.127.228/32	10.3.127.228 – 10.3.127.228	10.3.127.228
230	10.3.127.229/32	10.3.127.229 – 10.3.127.229	10.3.127.229
231	10.3.127.230/32	10.3.127.230 – 10.3.127.230	10.3.127.230
232	10.3.127.231/32	10.3.127.231 – 10.3.127.231	10.3.127.231
233	10.3.127.232/32	10.3.127.232 – 10.3.127.232	10.3.127.232
234	10.3.127.233/32	10.3.127.233 – 10.3.127.233	10.3.127.233
235	10.3.127.234/32	10.3.127.234 – 10.3.127.234	10.3.127.234
236	10.3.127.235/32	10.3.127.235 – 10.3.127.235	10.3.127.235
237	10.3.127.236/32	10.3.127.236 – 10.3.127.236	10.3.127.236
238	10.3.127.237/32	10.3.127.237 – 10.3.127.237	10.3.127.237
239	10.3.127.238/32	10.3.127.238 – 10.3.127.238	10.3.127.238
240	10.3.127.239/32	10.3.127.239 – 10.3.127.239	10.3.127.239
241	10.3.127.240/32	10.3.127.240 – 10.3.127.240	10.3.127.240
242	10.3.127.241/32	10.3.127.241 – 10.3.127.241	10.3.127.241
243	10.3.127.242/32	10.3.127.242 – 10.3.127.242	10.3.127.242
244	10.3.127.243/32	10.3.127.243 – 10.3.127.243	10.3.127.243
245	10.3.127.244/32	10.3.127.244 – 10.3.127.244	10.3.127.244
246	10.3.127.245/32	10.3.127.245 – 10.3.127.245	10.3.127.245
247	10.3.127.246/32	10.3.127.246 – 10.3.127.246	10.3.127.246
248	10.3.127.247/32	10.3.127.247 – 10.3.127.247	10.3.127.247
249	10.3.127.248/32	10.3.127.248 – 10.3.127.248	10.3.127.248
250	10.3.127.249/32	10.3.127.249 – 10.3.127.249	10.3.127.249
251	10.3.127.250/32	10.3.127.250 – 10.3.127.250	10.3.127.250
252	10.3.127.251/32	10.3.127.251 – 10.3.127.251	10.3.127.251
253	10.3.127.252/32	10.3.127.252 – 10.3.127.252	10.3.127.252
254	10.3.127.253/32	10.3.127.253 – 10.3.127.253	10.3.127.253
255	10.3.127.254/32	10.3.127.254 – 10.3.127.254	10.3.127.254
256	10.3.127.255/32	10.3.127.255 – 10.3.127.255	10.3.127.255

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 →