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)10.3.74.0/23

network10.3.74.0/23

broadcast10.3.75.255

first host10.3.74.1

last host10.3.75.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.74.0/23

address00001010.00000011.01001010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.01001010.00000000

broadcast00001010.00000011.01001011.11111111

green = network part, grey = host part

hex0x0a034a00

decimal167987712

reverse dns0.74.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:4a00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.74.0/30	10.3.74.1 – 10.3.74.2	10.3.74.3
2	10.3.74.4/30	10.3.74.5 – 10.3.74.6	10.3.74.7
3	10.3.74.8/30	10.3.74.9 – 10.3.74.10	10.3.74.11
4	10.3.74.12/30	10.3.74.13 – 10.3.74.14	10.3.74.15
5	10.3.74.16/30	10.3.74.17 – 10.3.74.18	10.3.74.19
6	10.3.74.20/30	10.3.74.21 – 10.3.74.22	10.3.74.23
7	10.3.74.24/30	10.3.74.25 – 10.3.74.26	10.3.74.27
8	10.3.74.28/30	10.3.74.29 – 10.3.74.30	10.3.74.31
9	10.3.74.32/30	10.3.74.33 – 10.3.74.34	10.3.74.35
10	10.3.74.36/30	10.3.74.37 – 10.3.74.38	10.3.74.39
11	10.3.74.40/30	10.3.74.41 – 10.3.74.42	10.3.74.43
12	10.3.74.44/30	10.3.74.45 – 10.3.74.46	10.3.74.47
13	10.3.74.48/30	10.3.74.49 – 10.3.74.50	10.3.74.51
14	10.3.74.52/30	10.3.74.53 – 10.3.74.54	10.3.74.55
15	10.3.74.56/30	10.3.74.57 – 10.3.74.58	10.3.74.59
16	10.3.74.60/30	10.3.74.61 – 10.3.74.62	10.3.74.63
17	10.3.74.64/30	10.3.74.65 – 10.3.74.66	10.3.74.67
18	10.3.74.68/30	10.3.74.69 – 10.3.74.70	10.3.74.71
19	10.3.74.72/30	10.3.74.73 – 10.3.74.74	10.3.74.75
20	10.3.74.76/30	10.3.74.77 – 10.3.74.78	10.3.74.79
21	10.3.74.80/30	10.3.74.81 – 10.3.74.82	10.3.74.83
22	10.3.74.84/30	10.3.74.85 – 10.3.74.86	10.3.74.87
23	10.3.74.88/30	10.3.74.89 – 10.3.74.90	10.3.74.91
24	10.3.74.92/30	10.3.74.93 – 10.3.74.94	10.3.74.95
25	10.3.74.96/30	10.3.74.97 – 10.3.74.98	10.3.74.99
26	10.3.74.100/30	10.3.74.101 – 10.3.74.102	10.3.74.103
27	10.3.74.104/30	10.3.74.105 – 10.3.74.106	10.3.74.107
28	10.3.74.108/30	10.3.74.109 – 10.3.74.110	10.3.74.111
29	10.3.74.112/30	10.3.74.113 – 10.3.74.114	10.3.74.115
30	10.3.74.116/30	10.3.74.117 – 10.3.74.118	10.3.74.119
31	10.3.74.120/30	10.3.74.121 – 10.3.74.122	10.3.74.123
32	10.3.74.124/30	10.3.74.125 – 10.3.74.126	10.3.74.127
33	10.3.74.128/30	10.3.74.129 – 10.3.74.130	10.3.74.131
34	10.3.74.132/30	10.3.74.133 – 10.3.74.134	10.3.74.135
35	10.3.74.136/30	10.3.74.137 – 10.3.74.138	10.3.74.139
36	10.3.74.140/30	10.3.74.141 – 10.3.74.142	10.3.74.143
37	10.3.74.144/30	10.3.74.145 – 10.3.74.146	10.3.74.147
38	10.3.74.148/30	10.3.74.149 – 10.3.74.150	10.3.74.151
39	10.3.74.152/30	10.3.74.153 – 10.3.74.154	10.3.74.155
40	10.3.74.156/30	10.3.74.157 – 10.3.74.158	10.3.74.159
41	10.3.74.160/30	10.3.74.161 – 10.3.74.162	10.3.74.163
42	10.3.74.164/30	10.3.74.165 – 10.3.74.166	10.3.74.167
43	10.3.74.168/30	10.3.74.169 – 10.3.74.170	10.3.74.171
44	10.3.74.172/30	10.3.74.173 – 10.3.74.174	10.3.74.175
45	10.3.74.176/30	10.3.74.177 – 10.3.74.178	10.3.74.179
46	10.3.74.180/30	10.3.74.181 – 10.3.74.182	10.3.74.183
47	10.3.74.184/30	10.3.74.185 – 10.3.74.186	10.3.74.187
48	10.3.74.188/30	10.3.74.189 – 10.3.74.190	10.3.74.191
49	10.3.74.192/30	10.3.74.193 – 10.3.74.194	10.3.74.195
50	10.3.74.196/30	10.3.74.197 – 10.3.74.198	10.3.74.199
51	10.3.74.200/30	10.3.74.201 – 10.3.74.202	10.3.74.203
52	10.3.74.204/30	10.3.74.205 – 10.3.74.206	10.3.74.207
53	10.3.74.208/30	10.3.74.209 – 10.3.74.210	10.3.74.211
54	10.3.74.212/30	10.3.74.213 – 10.3.74.214	10.3.74.215
55	10.3.74.216/30	10.3.74.217 – 10.3.74.218	10.3.74.219
56	10.3.74.220/30	10.3.74.221 – 10.3.74.222	10.3.74.223
57	10.3.74.224/30	10.3.74.225 – 10.3.74.226	10.3.74.227
58	10.3.74.228/30	10.3.74.229 – 10.3.74.230	10.3.74.231
59	10.3.74.232/30	10.3.74.233 – 10.3.74.234	10.3.74.235
60	10.3.74.236/30	10.3.74.237 – 10.3.74.238	10.3.74.239
61	10.3.74.240/30	10.3.74.241 – 10.3.74.242	10.3.74.243
62	10.3.74.244/30	10.3.74.245 – 10.3.74.246	10.3.74.247
63	10.3.74.248/30	10.3.74.249 – 10.3.74.250	10.3.74.251
64	10.3.74.252/30	10.3.74.253 – 10.3.74.254	10.3.74.255
65	10.3.75.0/30	10.3.75.1 – 10.3.75.2	10.3.75.3
66	10.3.75.4/30	10.3.75.5 – 10.3.75.6	10.3.75.7
67	10.3.75.8/30	10.3.75.9 – 10.3.75.10	10.3.75.11
68	10.3.75.12/30	10.3.75.13 – 10.3.75.14	10.3.75.15
69	10.3.75.16/30	10.3.75.17 – 10.3.75.18	10.3.75.19
70	10.3.75.20/30	10.3.75.21 – 10.3.75.22	10.3.75.23
71	10.3.75.24/30	10.3.75.25 – 10.3.75.26	10.3.75.27
72	10.3.75.28/30	10.3.75.29 – 10.3.75.30	10.3.75.31
73	10.3.75.32/30	10.3.75.33 – 10.3.75.34	10.3.75.35
74	10.3.75.36/30	10.3.75.37 – 10.3.75.38	10.3.75.39
75	10.3.75.40/30	10.3.75.41 – 10.3.75.42	10.3.75.43
76	10.3.75.44/30	10.3.75.45 – 10.3.75.46	10.3.75.47
77	10.3.75.48/30	10.3.75.49 – 10.3.75.50	10.3.75.51
78	10.3.75.52/30	10.3.75.53 – 10.3.75.54	10.3.75.55
79	10.3.75.56/30	10.3.75.57 – 10.3.75.58	10.3.75.59
80	10.3.75.60/30	10.3.75.61 – 10.3.75.62	10.3.75.63
81	10.3.75.64/30	10.3.75.65 – 10.3.75.66	10.3.75.67
82	10.3.75.68/30	10.3.75.69 – 10.3.75.70	10.3.75.71
83	10.3.75.72/30	10.3.75.73 – 10.3.75.74	10.3.75.75
84	10.3.75.76/30	10.3.75.77 – 10.3.75.78	10.3.75.79
85	10.3.75.80/30	10.3.75.81 – 10.3.75.82	10.3.75.83
86	10.3.75.84/30	10.3.75.85 – 10.3.75.86	10.3.75.87
87	10.3.75.88/30	10.3.75.89 – 10.3.75.90	10.3.75.91
88	10.3.75.92/30	10.3.75.93 – 10.3.75.94	10.3.75.95
89	10.3.75.96/30	10.3.75.97 – 10.3.75.98	10.3.75.99
90	10.3.75.100/30	10.3.75.101 – 10.3.75.102	10.3.75.103
91	10.3.75.104/30	10.3.75.105 – 10.3.75.106	10.3.75.107
92	10.3.75.108/30	10.3.75.109 – 10.3.75.110	10.3.75.111
93	10.3.75.112/30	10.3.75.113 – 10.3.75.114	10.3.75.115
94	10.3.75.116/30	10.3.75.117 – 10.3.75.118	10.3.75.119
95	10.3.75.120/30	10.3.75.121 – 10.3.75.122	10.3.75.123
96	10.3.75.124/30	10.3.75.125 – 10.3.75.126	10.3.75.127
97	10.3.75.128/30	10.3.75.129 – 10.3.75.130	10.3.75.131
98	10.3.75.132/30	10.3.75.133 – 10.3.75.134	10.3.75.135
99	10.3.75.136/30	10.3.75.137 – 10.3.75.138	10.3.75.139
100	10.3.75.140/30	10.3.75.141 – 10.3.75.142	10.3.75.143
101	10.3.75.144/30	10.3.75.145 – 10.3.75.146	10.3.75.147
102	10.3.75.148/30	10.3.75.149 – 10.3.75.150	10.3.75.151
103	10.3.75.152/30	10.3.75.153 – 10.3.75.154	10.3.75.155
104	10.3.75.156/30	10.3.75.157 – 10.3.75.158	10.3.75.159
105	10.3.75.160/30	10.3.75.161 – 10.3.75.162	10.3.75.163
106	10.3.75.164/30	10.3.75.165 – 10.3.75.166	10.3.75.167
107	10.3.75.168/30	10.3.75.169 – 10.3.75.170	10.3.75.171
108	10.3.75.172/30	10.3.75.173 – 10.3.75.174	10.3.75.175
109	10.3.75.176/30	10.3.75.177 – 10.3.75.178	10.3.75.179
110	10.3.75.180/30	10.3.75.181 – 10.3.75.182	10.3.75.183
111	10.3.75.184/30	10.3.75.185 – 10.3.75.186	10.3.75.187
112	10.3.75.188/30	10.3.75.189 – 10.3.75.190	10.3.75.191
113	10.3.75.192/30	10.3.75.193 – 10.3.75.194	10.3.75.195
114	10.3.75.196/30	10.3.75.197 – 10.3.75.198	10.3.75.199
115	10.3.75.200/30	10.3.75.201 – 10.3.75.202	10.3.75.203
116	10.3.75.204/30	10.3.75.205 – 10.3.75.206	10.3.75.207
117	10.3.75.208/30	10.3.75.209 – 10.3.75.210	10.3.75.211
118	10.3.75.212/30	10.3.75.213 – 10.3.75.214	10.3.75.215
119	10.3.75.216/30	10.3.75.217 – 10.3.75.218	10.3.75.219
120	10.3.75.220/30	10.3.75.221 – 10.3.75.222	10.3.75.223
121	10.3.75.224/30	10.3.75.225 – 10.3.75.226	10.3.75.227
122	10.3.75.228/30	10.3.75.229 – 10.3.75.230	10.3.75.231
123	10.3.75.232/30	10.3.75.233 – 10.3.75.234	10.3.75.235
124	10.3.75.236/30	10.3.75.237 – 10.3.75.238	10.3.75.239
125	10.3.75.240/30	10.3.75.241 – 10.3.75.242	10.3.75.243
126	10.3.75.244/30	10.3.75.245 – 10.3.75.246	10.3.75.247
127	10.3.75.248/30	10.3.75.249 – 10.3.75.250	10.3.75.251
128	10.3.75.252/30	10.3.75.253 – 10.3.75.254	10.3.75.255

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 /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 →