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)10.0.145.0/24

network10.0.145.0/24

broadcast10.0.145.255

first host10.0.145.1

last host10.0.145.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.145.0/24

address00001010.00000000.10010001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.10010001.00000000

broadcast00001010.00000000.10010001.11111111

green = network part, grey = host part

hex0x0a009100

decimal167809280

reverse dns0.145.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:9100

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.145.0/31	10.0.145.0 – 10.0.145.1	10.0.145.1
2	10.0.145.2/31	10.0.145.2 – 10.0.145.3	10.0.145.3
3	10.0.145.4/31	10.0.145.4 – 10.0.145.5	10.0.145.5
4	10.0.145.6/31	10.0.145.6 – 10.0.145.7	10.0.145.7
5	10.0.145.8/31	10.0.145.8 – 10.0.145.9	10.0.145.9
6	10.0.145.10/31	10.0.145.10 – 10.0.145.11	10.0.145.11
7	10.0.145.12/31	10.0.145.12 – 10.0.145.13	10.0.145.13
8	10.0.145.14/31	10.0.145.14 – 10.0.145.15	10.0.145.15
9	10.0.145.16/31	10.0.145.16 – 10.0.145.17	10.0.145.17
10	10.0.145.18/31	10.0.145.18 – 10.0.145.19	10.0.145.19
11	10.0.145.20/31	10.0.145.20 – 10.0.145.21	10.0.145.21
12	10.0.145.22/31	10.0.145.22 – 10.0.145.23	10.0.145.23
13	10.0.145.24/31	10.0.145.24 – 10.0.145.25	10.0.145.25
14	10.0.145.26/31	10.0.145.26 – 10.0.145.27	10.0.145.27
15	10.0.145.28/31	10.0.145.28 – 10.0.145.29	10.0.145.29
16	10.0.145.30/31	10.0.145.30 – 10.0.145.31	10.0.145.31
17	10.0.145.32/31	10.0.145.32 – 10.0.145.33	10.0.145.33
18	10.0.145.34/31	10.0.145.34 – 10.0.145.35	10.0.145.35
19	10.0.145.36/31	10.0.145.36 – 10.0.145.37	10.0.145.37
20	10.0.145.38/31	10.0.145.38 – 10.0.145.39	10.0.145.39
21	10.0.145.40/31	10.0.145.40 – 10.0.145.41	10.0.145.41
22	10.0.145.42/31	10.0.145.42 – 10.0.145.43	10.0.145.43
23	10.0.145.44/31	10.0.145.44 – 10.0.145.45	10.0.145.45
24	10.0.145.46/31	10.0.145.46 – 10.0.145.47	10.0.145.47
25	10.0.145.48/31	10.0.145.48 – 10.0.145.49	10.0.145.49
26	10.0.145.50/31	10.0.145.50 – 10.0.145.51	10.0.145.51
27	10.0.145.52/31	10.0.145.52 – 10.0.145.53	10.0.145.53
28	10.0.145.54/31	10.0.145.54 – 10.0.145.55	10.0.145.55
29	10.0.145.56/31	10.0.145.56 – 10.0.145.57	10.0.145.57
30	10.0.145.58/31	10.0.145.58 – 10.0.145.59	10.0.145.59
31	10.0.145.60/31	10.0.145.60 – 10.0.145.61	10.0.145.61
32	10.0.145.62/31	10.0.145.62 – 10.0.145.63	10.0.145.63
33	10.0.145.64/31	10.0.145.64 – 10.0.145.65	10.0.145.65
34	10.0.145.66/31	10.0.145.66 – 10.0.145.67	10.0.145.67
35	10.0.145.68/31	10.0.145.68 – 10.0.145.69	10.0.145.69
36	10.0.145.70/31	10.0.145.70 – 10.0.145.71	10.0.145.71
37	10.0.145.72/31	10.0.145.72 – 10.0.145.73	10.0.145.73
38	10.0.145.74/31	10.0.145.74 – 10.0.145.75	10.0.145.75
39	10.0.145.76/31	10.0.145.76 – 10.0.145.77	10.0.145.77
40	10.0.145.78/31	10.0.145.78 – 10.0.145.79	10.0.145.79
41	10.0.145.80/31	10.0.145.80 – 10.0.145.81	10.0.145.81
42	10.0.145.82/31	10.0.145.82 – 10.0.145.83	10.0.145.83
43	10.0.145.84/31	10.0.145.84 – 10.0.145.85	10.0.145.85
44	10.0.145.86/31	10.0.145.86 – 10.0.145.87	10.0.145.87
45	10.0.145.88/31	10.0.145.88 – 10.0.145.89	10.0.145.89
46	10.0.145.90/31	10.0.145.90 – 10.0.145.91	10.0.145.91
47	10.0.145.92/31	10.0.145.92 – 10.0.145.93	10.0.145.93
48	10.0.145.94/31	10.0.145.94 – 10.0.145.95	10.0.145.95
49	10.0.145.96/31	10.0.145.96 – 10.0.145.97	10.0.145.97
50	10.0.145.98/31	10.0.145.98 – 10.0.145.99	10.0.145.99
51	10.0.145.100/31	10.0.145.100 – 10.0.145.101	10.0.145.101
52	10.0.145.102/31	10.0.145.102 – 10.0.145.103	10.0.145.103
53	10.0.145.104/31	10.0.145.104 – 10.0.145.105	10.0.145.105
54	10.0.145.106/31	10.0.145.106 – 10.0.145.107	10.0.145.107
55	10.0.145.108/31	10.0.145.108 – 10.0.145.109	10.0.145.109
56	10.0.145.110/31	10.0.145.110 – 10.0.145.111	10.0.145.111
57	10.0.145.112/31	10.0.145.112 – 10.0.145.113	10.0.145.113
58	10.0.145.114/31	10.0.145.114 – 10.0.145.115	10.0.145.115
59	10.0.145.116/31	10.0.145.116 – 10.0.145.117	10.0.145.117
60	10.0.145.118/31	10.0.145.118 – 10.0.145.119	10.0.145.119
61	10.0.145.120/31	10.0.145.120 – 10.0.145.121	10.0.145.121
62	10.0.145.122/31	10.0.145.122 – 10.0.145.123	10.0.145.123
63	10.0.145.124/31	10.0.145.124 – 10.0.145.125	10.0.145.125
64	10.0.145.126/31	10.0.145.126 – 10.0.145.127	10.0.145.127
65	10.0.145.128/31	10.0.145.128 – 10.0.145.129	10.0.145.129
66	10.0.145.130/31	10.0.145.130 – 10.0.145.131	10.0.145.131
67	10.0.145.132/31	10.0.145.132 – 10.0.145.133	10.0.145.133
68	10.0.145.134/31	10.0.145.134 – 10.0.145.135	10.0.145.135
69	10.0.145.136/31	10.0.145.136 – 10.0.145.137	10.0.145.137
70	10.0.145.138/31	10.0.145.138 – 10.0.145.139	10.0.145.139
71	10.0.145.140/31	10.0.145.140 – 10.0.145.141	10.0.145.141
72	10.0.145.142/31	10.0.145.142 – 10.0.145.143	10.0.145.143
73	10.0.145.144/31	10.0.145.144 – 10.0.145.145	10.0.145.145
74	10.0.145.146/31	10.0.145.146 – 10.0.145.147	10.0.145.147
75	10.0.145.148/31	10.0.145.148 – 10.0.145.149	10.0.145.149
76	10.0.145.150/31	10.0.145.150 – 10.0.145.151	10.0.145.151
77	10.0.145.152/31	10.0.145.152 – 10.0.145.153	10.0.145.153
78	10.0.145.154/31	10.0.145.154 – 10.0.145.155	10.0.145.155
79	10.0.145.156/31	10.0.145.156 – 10.0.145.157	10.0.145.157
80	10.0.145.158/31	10.0.145.158 – 10.0.145.159	10.0.145.159
81	10.0.145.160/31	10.0.145.160 – 10.0.145.161	10.0.145.161
82	10.0.145.162/31	10.0.145.162 – 10.0.145.163	10.0.145.163
83	10.0.145.164/31	10.0.145.164 – 10.0.145.165	10.0.145.165
84	10.0.145.166/31	10.0.145.166 – 10.0.145.167	10.0.145.167
85	10.0.145.168/31	10.0.145.168 – 10.0.145.169	10.0.145.169
86	10.0.145.170/31	10.0.145.170 – 10.0.145.171	10.0.145.171
87	10.0.145.172/31	10.0.145.172 – 10.0.145.173	10.0.145.173
88	10.0.145.174/31	10.0.145.174 – 10.0.145.175	10.0.145.175
89	10.0.145.176/31	10.0.145.176 – 10.0.145.177	10.0.145.177
90	10.0.145.178/31	10.0.145.178 – 10.0.145.179	10.0.145.179
91	10.0.145.180/31	10.0.145.180 – 10.0.145.181	10.0.145.181
92	10.0.145.182/31	10.0.145.182 – 10.0.145.183	10.0.145.183
93	10.0.145.184/31	10.0.145.184 – 10.0.145.185	10.0.145.185
94	10.0.145.186/31	10.0.145.186 – 10.0.145.187	10.0.145.187
95	10.0.145.188/31	10.0.145.188 – 10.0.145.189	10.0.145.189
96	10.0.145.190/31	10.0.145.190 – 10.0.145.191	10.0.145.191
97	10.0.145.192/31	10.0.145.192 – 10.0.145.193	10.0.145.193
98	10.0.145.194/31	10.0.145.194 – 10.0.145.195	10.0.145.195
99	10.0.145.196/31	10.0.145.196 – 10.0.145.197	10.0.145.197
100	10.0.145.198/31	10.0.145.198 – 10.0.145.199	10.0.145.199
101	10.0.145.200/31	10.0.145.200 – 10.0.145.201	10.0.145.201
102	10.0.145.202/31	10.0.145.202 – 10.0.145.203	10.0.145.203
103	10.0.145.204/31	10.0.145.204 – 10.0.145.205	10.0.145.205
104	10.0.145.206/31	10.0.145.206 – 10.0.145.207	10.0.145.207
105	10.0.145.208/31	10.0.145.208 – 10.0.145.209	10.0.145.209
106	10.0.145.210/31	10.0.145.210 – 10.0.145.211	10.0.145.211
107	10.0.145.212/31	10.0.145.212 – 10.0.145.213	10.0.145.213
108	10.0.145.214/31	10.0.145.214 – 10.0.145.215	10.0.145.215
109	10.0.145.216/31	10.0.145.216 – 10.0.145.217	10.0.145.217
110	10.0.145.218/31	10.0.145.218 – 10.0.145.219	10.0.145.219
111	10.0.145.220/31	10.0.145.220 – 10.0.145.221	10.0.145.221
112	10.0.145.222/31	10.0.145.222 – 10.0.145.223	10.0.145.223
113	10.0.145.224/31	10.0.145.224 – 10.0.145.225	10.0.145.225
114	10.0.145.226/31	10.0.145.226 – 10.0.145.227	10.0.145.227
115	10.0.145.228/31	10.0.145.228 – 10.0.145.229	10.0.145.229
116	10.0.145.230/31	10.0.145.230 – 10.0.145.231	10.0.145.231
117	10.0.145.232/31	10.0.145.232 – 10.0.145.233	10.0.145.233
118	10.0.145.234/31	10.0.145.234 – 10.0.145.235	10.0.145.235
119	10.0.145.236/31	10.0.145.236 – 10.0.145.237	10.0.145.237
120	10.0.145.238/31	10.0.145.238 – 10.0.145.239	10.0.145.239
121	10.0.145.240/31	10.0.145.240 – 10.0.145.241	10.0.145.241
122	10.0.145.242/31	10.0.145.242 – 10.0.145.243	10.0.145.243
123	10.0.145.244/31	10.0.145.244 – 10.0.145.245	10.0.145.245
124	10.0.145.246/31	10.0.145.246 – 10.0.145.247	10.0.145.247
125	10.0.145.248/31	10.0.145.248 – 10.0.145.249	10.0.145.249
126	10.0.145.250/31	10.0.145.250 – 10.0.145.251	10.0.145.251
127	10.0.145.252/31	10.0.145.252 – 10.0.145.253	10.0.145.253
128	10.0.145.254/31	10.0.145.254 – 10.0.145.255	10.0.145.255

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 →