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)10.2.102.0/23

network10.2.102.0/23

broadcast10.2.103.255

first host10.2.102.1

last host10.2.103.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.102.0/23

address00001010.00000010.01100110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01100110.00000000

broadcast00001010.00000010.01100111.11111111

green = network part, grey = host part

hex0x0a026600

decimal167929344

reverse dns0.102.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:6600

/23 split into /32 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.102.0/32	10.2.102.0 – 10.2.102.0	10.2.102.0
2	10.2.102.1/32	10.2.102.1 – 10.2.102.1	10.2.102.1
3	10.2.102.2/32	10.2.102.2 – 10.2.102.2	10.2.102.2
4	10.2.102.3/32	10.2.102.3 – 10.2.102.3	10.2.102.3
5	10.2.102.4/32	10.2.102.4 – 10.2.102.4	10.2.102.4
6	10.2.102.5/32	10.2.102.5 – 10.2.102.5	10.2.102.5
7	10.2.102.6/32	10.2.102.6 – 10.2.102.6	10.2.102.6
8	10.2.102.7/32	10.2.102.7 – 10.2.102.7	10.2.102.7
9	10.2.102.8/32	10.2.102.8 – 10.2.102.8	10.2.102.8
10	10.2.102.9/32	10.2.102.9 – 10.2.102.9	10.2.102.9
11	10.2.102.10/32	10.2.102.10 – 10.2.102.10	10.2.102.10
12	10.2.102.11/32	10.2.102.11 – 10.2.102.11	10.2.102.11
13	10.2.102.12/32	10.2.102.12 – 10.2.102.12	10.2.102.12
14	10.2.102.13/32	10.2.102.13 – 10.2.102.13	10.2.102.13
15	10.2.102.14/32	10.2.102.14 – 10.2.102.14	10.2.102.14
16	10.2.102.15/32	10.2.102.15 – 10.2.102.15	10.2.102.15
17	10.2.102.16/32	10.2.102.16 – 10.2.102.16	10.2.102.16
18	10.2.102.17/32	10.2.102.17 – 10.2.102.17	10.2.102.17
19	10.2.102.18/32	10.2.102.18 – 10.2.102.18	10.2.102.18
20	10.2.102.19/32	10.2.102.19 – 10.2.102.19	10.2.102.19
21	10.2.102.20/32	10.2.102.20 – 10.2.102.20	10.2.102.20
22	10.2.102.21/32	10.2.102.21 – 10.2.102.21	10.2.102.21
23	10.2.102.22/32	10.2.102.22 – 10.2.102.22	10.2.102.22
24	10.2.102.23/32	10.2.102.23 – 10.2.102.23	10.2.102.23
25	10.2.102.24/32	10.2.102.24 – 10.2.102.24	10.2.102.24
26	10.2.102.25/32	10.2.102.25 – 10.2.102.25	10.2.102.25
27	10.2.102.26/32	10.2.102.26 – 10.2.102.26	10.2.102.26
28	10.2.102.27/32	10.2.102.27 – 10.2.102.27	10.2.102.27
29	10.2.102.28/32	10.2.102.28 – 10.2.102.28	10.2.102.28
30	10.2.102.29/32	10.2.102.29 – 10.2.102.29	10.2.102.29
31	10.2.102.30/32	10.2.102.30 – 10.2.102.30	10.2.102.30
32	10.2.102.31/32	10.2.102.31 – 10.2.102.31	10.2.102.31
33	10.2.102.32/32	10.2.102.32 – 10.2.102.32	10.2.102.32
34	10.2.102.33/32	10.2.102.33 – 10.2.102.33	10.2.102.33
35	10.2.102.34/32	10.2.102.34 – 10.2.102.34	10.2.102.34
36	10.2.102.35/32	10.2.102.35 – 10.2.102.35	10.2.102.35
37	10.2.102.36/32	10.2.102.36 – 10.2.102.36	10.2.102.36
38	10.2.102.37/32	10.2.102.37 – 10.2.102.37	10.2.102.37
39	10.2.102.38/32	10.2.102.38 – 10.2.102.38	10.2.102.38
40	10.2.102.39/32	10.2.102.39 – 10.2.102.39	10.2.102.39
41	10.2.102.40/32	10.2.102.40 – 10.2.102.40	10.2.102.40
42	10.2.102.41/32	10.2.102.41 – 10.2.102.41	10.2.102.41
43	10.2.102.42/32	10.2.102.42 – 10.2.102.42	10.2.102.42
44	10.2.102.43/32	10.2.102.43 – 10.2.102.43	10.2.102.43
45	10.2.102.44/32	10.2.102.44 – 10.2.102.44	10.2.102.44
46	10.2.102.45/32	10.2.102.45 – 10.2.102.45	10.2.102.45
47	10.2.102.46/32	10.2.102.46 – 10.2.102.46	10.2.102.46
48	10.2.102.47/32	10.2.102.47 – 10.2.102.47	10.2.102.47
49	10.2.102.48/32	10.2.102.48 – 10.2.102.48	10.2.102.48
50	10.2.102.49/32	10.2.102.49 – 10.2.102.49	10.2.102.49
51	10.2.102.50/32	10.2.102.50 – 10.2.102.50	10.2.102.50
52	10.2.102.51/32	10.2.102.51 – 10.2.102.51	10.2.102.51
53	10.2.102.52/32	10.2.102.52 – 10.2.102.52	10.2.102.52
54	10.2.102.53/32	10.2.102.53 – 10.2.102.53	10.2.102.53
55	10.2.102.54/32	10.2.102.54 – 10.2.102.54	10.2.102.54
56	10.2.102.55/32	10.2.102.55 – 10.2.102.55	10.2.102.55
57	10.2.102.56/32	10.2.102.56 – 10.2.102.56	10.2.102.56
58	10.2.102.57/32	10.2.102.57 – 10.2.102.57	10.2.102.57
59	10.2.102.58/32	10.2.102.58 – 10.2.102.58	10.2.102.58
60	10.2.102.59/32	10.2.102.59 – 10.2.102.59	10.2.102.59
61	10.2.102.60/32	10.2.102.60 – 10.2.102.60	10.2.102.60
62	10.2.102.61/32	10.2.102.61 – 10.2.102.61	10.2.102.61
63	10.2.102.62/32	10.2.102.62 – 10.2.102.62	10.2.102.62
64	10.2.102.63/32	10.2.102.63 – 10.2.102.63	10.2.102.63
65	10.2.102.64/32	10.2.102.64 – 10.2.102.64	10.2.102.64
66	10.2.102.65/32	10.2.102.65 – 10.2.102.65	10.2.102.65
67	10.2.102.66/32	10.2.102.66 – 10.2.102.66	10.2.102.66
68	10.2.102.67/32	10.2.102.67 – 10.2.102.67	10.2.102.67
69	10.2.102.68/32	10.2.102.68 – 10.2.102.68	10.2.102.68
70	10.2.102.69/32	10.2.102.69 – 10.2.102.69	10.2.102.69
71	10.2.102.70/32	10.2.102.70 – 10.2.102.70	10.2.102.70
72	10.2.102.71/32	10.2.102.71 – 10.2.102.71	10.2.102.71
73	10.2.102.72/32	10.2.102.72 – 10.2.102.72	10.2.102.72
74	10.2.102.73/32	10.2.102.73 – 10.2.102.73	10.2.102.73
75	10.2.102.74/32	10.2.102.74 – 10.2.102.74	10.2.102.74
76	10.2.102.75/32	10.2.102.75 – 10.2.102.75	10.2.102.75
77	10.2.102.76/32	10.2.102.76 – 10.2.102.76	10.2.102.76
78	10.2.102.77/32	10.2.102.77 – 10.2.102.77	10.2.102.77
79	10.2.102.78/32	10.2.102.78 – 10.2.102.78	10.2.102.78
80	10.2.102.79/32	10.2.102.79 – 10.2.102.79	10.2.102.79
81	10.2.102.80/32	10.2.102.80 – 10.2.102.80	10.2.102.80
82	10.2.102.81/32	10.2.102.81 – 10.2.102.81	10.2.102.81
83	10.2.102.82/32	10.2.102.82 – 10.2.102.82	10.2.102.82
84	10.2.102.83/32	10.2.102.83 – 10.2.102.83	10.2.102.83
85	10.2.102.84/32	10.2.102.84 – 10.2.102.84	10.2.102.84
86	10.2.102.85/32	10.2.102.85 – 10.2.102.85	10.2.102.85
87	10.2.102.86/32	10.2.102.86 – 10.2.102.86	10.2.102.86
88	10.2.102.87/32	10.2.102.87 – 10.2.102.87	10.2.102.87
89	10.2.102.88/32	10.2.102.88 – 10.2.102.88	10.2.102.88
90	10.2.102.89/32	10.2.102.89 – 10.2.102.89	10.2.102.89
91	10.2.102.90/32	10.2.102.90 – 10.2.102.90	10.2.102.90
92	10.2.102.91/32	10.2.102.91 – 10.2.102.91	10.2.102.91
93	10.2.102.92/32	10.2.102.92 – 10.2.102.92	10.2.102.92
94	10.2.102.93/32	10.2.102.93 – 10.2.102.93	10.2.102.93
95	10.2.102.94/32	10.2.102.94 – 10.2.102.94	10.2.102.94
96	10.2.102.95/32	10.2.102.95 – 10.2.102.95	10.2.102.95
97	10.2.102.96/32	10.2.102.96 – 10.2.102.96	10.2.102.96
98	10.2.102.97/32	10.2.102.97 – 10.2.102.97	10.2.102.97
99	10.2.102.98/32	10.2.102.98 – 10.2.102.98	10.2.102.98
100	10.2.102.99/32	10.2.102.99 – 10.2.102.99	10.2.102.99
101	10.2.102.100/32	10.2.102.100 – 10.2.102.100	10.2.102.100
102	10.2.102.101/32	10.2.102.101 – 10.2.102.101	10.2.102.101
103	10.2.102.102/32	10.2.102.102 – 10.2.102.102	10.2.102.102
104	10.2.102.103/32	10.2.102.103 – 10.2.102.103	10.2.102.103
105	10.2.102.104/32	10.2.102.104 – 10.2.102.104	10.2.102.104
106	10.2.102.105/32	10.2.102.105 – 10.2.102.105	10.2.102.105
107	10.2.102.106/32	10.2.102.106 – 10.2.102.106	10.2.102.106
108	10.2.102.107/32	10.2.102.107 – 10.2.102.107	10.2.102.107
109	10.2.102.108/32	10.2.102.108 – 10.2.102.108	10.2.102.108
110	10.2.102.109/32	10.2.102.109 – 10.2.102.109	10.2.102.109
111	10.2.102.110/32	10.2.102.110 – 10.2.102.110	10.2.102.110
112	10.2.102.111/32	10.2.102.111 – 10.2.102.111	10.2.102.111
113	10.2.102.112/32	10.2.102.112 – 10.2.102.112	10.2.102.112
114	10.2.102.113/32	10.2.102.113 – 10.2.102.113	10.2.102.113
115	10.2.102.114/32	10.2.102.114 – 10.2.102.114	10.2.102.114
116	10.2.102.115/32	10.2.102.115 – 10.2.102.115	10.2.102.115
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119	10.2.102.118/32	10.2.102.118 – 10.2.102.118	10.2.102.118
120	10.2.102.119/32	10.2.102.119 – 10.2.102.119	10.2.102.119
121	10.2.102.120/32	10.2.102.120 – 10.2.102.120	10.2.102.120
122	10.2.102.121/32	10.2.102.121 – 10.2.102.121	10.2.102.121
123	10.2.102.122/32	10.2.102.122 – 10.2.102.122	10.2.102.122
124	10.2.102.123/32	10.2.102.123 – 10.2.102.123	10.2.102.123
125	10.2.102.124/32	10.2.102.124 – 10.2.102.124	10.2.102.124
126	10.2.102.125/32	10.2.102.125 – 10.2.102.125	10.2.102.125
127	10.2.102.126/32	10.2.102.126 – 10.2.102.126	10.2.102.126
128	10.2.102.127/32	10.2.102.127 – 10.2.102.127	10.2.102.127
129	10.2.102.128/32	10.2.102.128 – 10.2.102.128	10.2.102.128
130	10.2.102.129/32	10.2.102.129 – 10.2.102.129	10.2.102.129
131	10.2.102.130/32	10.2.102.130 – 10.2.102.130	10.2.102.130
132	10.2.102.131/32	10.2.102.131 – 10.2.102.131	10.2.102.131
133	10.2.102.132/32	10.2.102.132 – 10.2.102.132	10.2.102.132
134	10.2.102.133/32	10.2.102.133 – 10.2.102.133	10.2.102.133
135	10.2.102.134/32	10.2.102.134 – 10.2.102.134	10.2.102.134
136	10.2.102.135/32	10.2.102.135 – 10.2.102.135	10.2.102.135
137	10.2.102.136/32	10.2.102.136 – 10.2.102.136	10.2.102.136
138	10.2.102.137/32	10.2.102.137 – 10.2.102.137	10.2.102.137
139	10.2.102.138/32	10.2.102.138 – 10.2.102.138	10.2.102.138
140	10.2.102.139/32	10.2.102.139 – 10.2.102.139	10.2.102.139
141	10.2.102.140/32	10.2.102.140 – 10.2.102.140	10.2.102.140
142	10.2.102.141/32	10.2.102.141 – 10.2.102.141	10.2.102.141
143	10.2.102.142/32	10.2.102.142 – 10.2.102.142	10.2.102.142
144	10.2.102.143/32	10.2.102.143 – 10.2.102.143	10.2.102.143
145	10.2.102.144/32	10.2.102.144 – 10.2.102.144	10.2.102.144
146	10.2.102.145/32	10.2.102.145 – 10.2.102.145	10.2.102.145
147	10.2.102.146/32	10.2.102.146 – 10.2.102.146	10.2.102.146
148	10.2.102.147/32	10.2.102.147 – 10.2.102.147	10.2.102.147
149	10.2.102.148/32	10.2.102.148 – 10.2.102.148	10.2.102.148
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210	10.2.102.209/32	10.2.102.209 – 10.2.102.209	10.2.102.209
211	10.2.102.210/32	10.2.102.210 – 10.2.102.210	10.2.102.210
212	10.2.102.211/32	10.2.102.211 – 10.2.102.211	10.2.102.211
213	10.2.102.212/32	10.2.102.212 – 10.2.102.212	10.2.102.212
214	10.2.102.213/32	10.2.102.213 – 10.2.102.213	10.2.102.213
215	10.2.102.214/32	10.2.102.214 – 10.2.102.214	10.2.102.214
216	10.2.102.215/32	10.2.102.215 – 10.2.102.215	10.2.102.215
217	10.2.102.216/32	10.2.102.216 – 10.2.102.216	10.2.102.216
218	10.2.102.217/32	10.2.102.217 – 10.2.102.217	10.2.102.217
219	10.2.102.218/32	10.2.102.218 – 10.2.102.218	10.2.102.218
220	10.2.102.219/32	10.2.102.219 – 10.2.102.219	10.2.102.219
221	10.2.102.220/32	10.2.102.220 – 10.2.102.220	10.2.102.220
222	10.2.102.221/32	10.2.102.221 – 10.2.102.221	10.2.102.221
223	10.2.102.222/32	10.2.102.222 – 10.2.102.222	10.2.102.222
224	10.2.102.223/32	10.2.102.223 – 10.2.102.223	10.2.102.223
225	10.2.102.224/32	10.2.102.224 – 10.2.102.224	10.2.102.224
226	10.2.102.225/32	10.2.102.225 – 10.2.102.225	10.2.102.225
227	10.2.102.226/32	10.2.102.226 – 10.2.102.226	10.2.102.226
228	10.2.102.227/32	10.2.102.227 – 10.2.102.227	10.2.102.227
229	10.2.102.228/32	10.2.102.228 – 10.2.102.228	10.2.102.228
230	10.2.102.229/32	10.2.102.229 – 10.2.102.229	10.2.102.229
231	10.2.102.230/32	10.2.102.230 – 10.2.102.230	10.2.102.230
232	10.2.102.231/32	10.2.102.231 – 10.2.102.231	10.2.102.231
233	10.2.102.232/32	10.2.102.232 – 10.2.102.232	10.2.102.232
234	10.2.102.233/32	10.2.102.233 – 10.2.102.233	10.2.102.233
235	10.2.102.234/32	10.2.102.234 – 10.2.102.234	10.2.102.234
236	10.2.102.235/32	10.2.102.235 – 10.2.102.235	10.2.102.235
237	10.2.102.236/32	10.2.102.236 – 10.2.102.236	10.2.102.236
238	10.2.102.237/32	10.2.102.237 – 10.2.102.237	10.2.102.237
239	10.2.102.238/32	10.2.102.238 – 10.2.102.238	10.2.102.238
240	10.2.102.239/32	10.2.102.239 – 10.2.102.239	10.2.102.239
241	10.2.102.240/32	10.2.102.240 – 10.2.102.240	10.2.102.240
242	10.2.102.241/32	10.2.102.241 – 10.2.102.241	10.2.102.241
243	10.2.102.242/32	10.2.102.242 – 10.2.102.242	10.2.102.242
244	10.2.102.243/32	10.2.102.243 – 10.2.102.243	10.2.102.243
245	10.2.102.244/32	10.2.102.244 – 10.2.102.244	10.2.102.244
246	10.2.102.245/32	10.2.102.245 – 10.2.102.245	10.2.102.245
247	10.2.102.246/32	10.2.102.246 – 10.2.102.246	10.2.102.246
248	10.2.102.247/32	10.2.102.247 – 10.2.102.247	10.2.102.247
249	10.2.102.248/32	10.2.102.248 – 10.2.102.248	10.2.102.248
250	10.2.102.249/32	10.2.102.249 – 10.2.102.249	10.2.102.249
251	10.2.102.250/32	10.2.102.250 – 10.2.102.250	10.2.102.250
252	10.2.102.251/32	10.2.102.251 – 10.2.102.251	10.2.102.251
253	10.2.102.252/32	10.2.102.252 – 10.2.102.252	10.2.102.252
254	10.2.102.253/32	10.2.102.253 – 10.2.102.253	10.2.102.253
255	10.2.102.254/32	10.2.102.254 – 10.2.102.254	10.2.102.254
256	10.2.102.255/32	10.2.102.255 – 10.2.102.255	10.2.102.255

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