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)10.2.74.0/23

network10.2.74.0/23

broadcast10.2.75.255

first host10.2.74.1

last host10.2.75.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.74.0/23

address00001010.00000010.01001010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01001010.00000000

broadcast00001010.00000010.01001011.11111111

green = network part, grey = host part

hex0x0a024a00

decimal167922176

reverse dns0.74.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4a00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.74.0/30	10.2.74.1 – 10.2.74.2	10.2.74.3
2	10.2.74.4/30	10.2.74.5 – 10.2.74.6	10.2.74.7
3	10.2.74.8/30	10.2.74.9 – 10.2.74.10	10.2.74.11
4	10.2.74.12/30	10.2.74.13 – 10.2.74.14	10.2.74.15
5	10.2.74.16/30	10.2.74.17 – 10.2.74.18	10.2.74.19
6	10.2.74.20/30	10.2.74.21 – 10.2.74.22	10.2.74.23
7	10.2.74.24/30	10.2.74.25 – 10.2.74.26	10.2.74.27
8	10.2.74.28/30	10.2.74.29 – 10.2.74.30	10.2.74.31
9	10.2.74.32/30	10.2.74.33 – 10.2.74.34	10.2.74.35
10	10.2.74.36/30	10.2.74.37 – 10.2.74.38	10.2.74.39
11	10.2.74.40/30	10.2.74.41 – 10.2.74.42	10.2.74.43
12	10.2.74.44/30	10.2.74.45 – 10.2.74.46	10.2.74.47
13	10.2.74.48/30	10.2.74.49 – 10.2.74.50	10.2.74.51
14	10.2.74.52/30	10.2.74.53 – 10.2.74.54	10.2.74.55
15	10.2.74.56/30	10.2.74.57 – 10.2.74.58	10.2.74.59
16	10.2.74.60/30	10.2.74.61 – 10.2.74.62	10.2.74.63
17	10.2.74.64/30	10.2.74.65 – 10.2.74.66	10.2.74.67
18	10.2.74.68/30	10.2.74.69 – 10.2.74.70	10.2.74.71
19	10.2.74.72/30	10.2.74.73 – 10.2.74.74	10.2.74.75
20	10.2.74.76/30	10.2.74.77 – 10.2.74.78	10.2.74.79
21	10.2.74.80/30	10.2.74.81 – 10.2.74.82	10.2.74.83
22	10.2.74.84/30	10.2.74.85 – 10.2.74.86	10.2.74.87
23	10.2.74.88/30	10.2.74.89 – 10.2.74.90	10.2.74.91
24	10.2.74.92/30	10.2.74.93 – 10.2.74.94	10.2.74.95
25	10.2.74.96/30	10.2.74.97 – 10.2.74.98	10.2.74.99
26	10.2.74.100/30	10.2.74.101 – 10.2.74.102	10.2.74.103
27	10.2.74.104/30	10.2.74.105 – 10.2.74.106	10.2.74.107
28	10.2.74.108/30	10.2.74.109 – 10.2.74.110	10.2.74.111
29	10.2.74.112/30	10.2.74.113 – 10.2.74.114	10.2.74.115
30	10.2.74.116/30	10.2.74.117 – 10.2.74.118	10.2.74.119
31	10.2.74.120/30	10.2.74.121 – 10.2.74.122	10.2.74.123
32	10.2.74.124/30	10.2.74.125 – 10.2.74.126	10.2.74.127
33	10.2.74.128/30	10.2.74.129 – 10.2.74.130	10.2.74.131
34	10.2.74.132/30	10.2.74.133 – 10.2.74.134	10.2.74.135
35	10.2.74.136/30	10.2.74.137 – 10.2.74.138	10.2.74.139
36	10.2.74.140/30	10.2.74.141 – 10.2.74.142	10.2.74.143
37	10.2.74.144/30	10.2.74.145 – 10.2.74.146	10.2.74.147
38	10.2.74.148/30	10.2.74.149 – 10.2.74.150	10.2.74.151
39	10.2.74.152/30	10.2.74.153 – 10.2.74.154	10.2.74.155
40	10.2.74.156/30	10.2.74.157 – 10.2.74.158	10.2.74.159
41	10.2.74.160/30	10.2.74.161 – 10.2.74.162	10.2.74.163
42	10.2.74.164/30	10.2.74.165 – 10.2.74.166	10.2.74.167
43	10.2.74.168/30	10.2.74.169 – 10.2.74.170	10.2.74.171
44	10.2.74.172/30	10.2.74.173 – 10.2.74.174	10.2.74.175
45	10.2.74.176/30	10.2.74.177 – 10.2.74.178	10.2.74.179
46	10.2.74.180/30	10.2.74.181 – 10.2.74.182	10.2.74.183
47	10.2.74.184/30	10.2.74.185 – 10.2.74.186	10.2.74.187
48	10.2.74.188/30	10.2.74.189 – 10.2.74.190	10.2.74.191
49	10.2.74.192/30	10.2.74.193 – 10.2.74.194	10.2.74.195
50	10.2.74.196/30	10.2.74.197 – 10.2.74.198	10.2.74.199
51	10.2.74.200/30	10.2.74.201 – 10.2.74.202	10.2.74.203
52	10.2.74.204/30	10.2.74.205 – 10.2.74.206	10.2.74.207
53	10.2.74.208/30	10.2.74.209 – 10.2.74.210	10.2.74.211
54	10.2.74.212/30	10.2.74.213 – 10.2.74.214	10.2.74.215
55	10.2.74.216/30	10.2.74.217 – 10.2.74.218	10.2.74.219
56	10.2.74.220/30	10.2.74.221 – 10.2.74.222	10.2.74.223
57	10.2.74.224/30	10.2.74.225 – 10.2.74.226	10.2.74.227
58	10.2.74.228/30	10.2.74.229 – 10.2.74.230	10.2.74.231
59	10.2.74.232/30	10.2.74.233 – 10.2.74.234	10.2.74.235
60	10.2.74.236/30	10.2.74.237 – 10.2.74.238	10.2.74.239
61	10.2.74.240/30	10.2.74.241 – 10.2.74.242	10.2.74.243
62	10.2.74.244/30	10.2.74.245 – 10.2.74.246	10.2.74.247
63	10.2.74.248/30	10.2.74.249 – 10.2.74.250	10.2.74.251
64	10.2.74.252/30	10.2.74.253 – 10.2.74.254	10.2.74.255
65	10.2.75.0/30	10.2.75.1 – 10.2.75.2	10.2.75.3
66	10.2.75.4/30	10.2.75.5 – 10.2.75.6	10.2.75.7
67	10.2.75.8/30	10.2.75.9 – 10.2.75.10	10.2.75.11
68	10.2.75.12/30	10.2.75.13 – 10.2.75.14	10.2.75.15
69	10.2.75.16/30	10.2.75.17 – 10.2.75.18	10.2.75.19
70	10.2.75.20/30	10.2.75.21 – 10.2.75.22	10.2.75.23
71	10.2.75.24/30	10.2.75.25 – 10.2.75.26	10.2.75.27
72	10.2.75.28/30	10.2.75.29 – 10.2.75.30	10.2.75.31
73	10.2.75.32/30	10.2.75.33 – 10.2.75.34	10.2.75.35
74	10.2.75.36/30	10.2.75.37 – 10.2.75.38	10.2.75.39
75	10.2.75.40/30	10.2.75.41 – 10.2.75.42	10.2.75.43
76	10.2.75.44/30	10.2.75.45 – 10.2.75.46	10.2.75.47
77	10.2.75.48/30	10.2.75.49 – 10.2.75.50	10.2.75.51
78	10.2.75.52/30	10.2.75.53 – 10.2.75.54	10.2.75.55
79	10.2.75.56/30	10.2.75.57 – 10.2.75.58	10.2.75.59
80	10.2.75.60/30	10.2.75.61 – 10.2.75.62	10.2.75.63
81	10.2.75.64/30	10.2.75.65 – 10.2.75.66	10.2.75.67
82	10.2.75.68/30	10.2.75.69 – 10.2.75.70	10.2.75.71
83	10.2.75.72/30	10.2.75.73 – 10.2.75.74	10.2.75.75
84	10.2.75.76/30	10.2.75.77 – 10.2.75.78	10.2.75.79
85	10.2.75.80/30	10.2.75.81 – 10.2.75.82	10.2.75.83
86	10.2.75.84/30	10.2.75.85 – 10.2.75.86	10.2.75.87
87	10.2.75.88/30	10.2.75.89 – 10.2.75.90	10.2.75.91
88	10.2.75.92/30	10.2.75.93 – 10.2.75.94	10.2.75.95
89	10.2.75.96/30	10.2.75.97 – 10.2.75.98	10.2.75.99
90	10.2.75.100/30	10.2.75.101 – 10.2.75.102	10.2.75.103
91	10.2.75.104/30	10.2.75.105 – 10.2.75.106	10.2.75.107
92	10.2.75.108/30	10.2.75.109 – 10.2.75.110	10.2.75.111
93	10.2.75.112/30	10.2.75.113 – 10.2.75.114	10.2.75.115
94	10.2.75.116/30	10.2.75.117 – 10.2.75.118	10.2.75.119
95	10.2.75.120/30	10.2.75.121 – 10.2.75.122	10.2.75.123
96	10.2.75.124/30	10.2.75.125 – 10.2.75.126	10.2.75.127
97	10.2.75.128/30	10.2.75.129 – 10.2.75.130	10.2.75.131
98	10.2.75.132/30	10.2.75.133 – 10.2.75.134	10.2.75.135
99	10.2.75.136/30	10.2.75.137 – 10.2.75.138	10.2.75.139
100	10.2.75.140/30	10.2.75.141 – 10.2.75.142	10.2.75.143
101	10.2.75.144/30	10.2.75.145 – 10.2.75.146	10.2.75.147
102	10.2.75.148/30	10.2.75.149 – 10.2.75.150	10.2.75.151
103	10.2.75.152/30	10.2.75.153 – 10.2.75.154	10.2.75.155
104	10.2.75.156/30	10.2.75.157 – 10.2.75.158	10.2.75.159
105	10.2.75.160/30	10.2.75.161 – 10.2.75.162	10.2.75.163
106	10.2.75.164/30	10.2.75.165 – 10.2.75.166	10.2.75.167
107	10.2.75.168/30	10.2.75.169 – 10.2.75.170	10.2.75.171
108	10.2.75.172/30	10.2.75.173 – 10.2.75.174	10.2.75.175
109	10.2.75.176/30	10.2.75.177 – 10.2.75.178	10.2.75.179
110	10.2.75.180/30	10.2.75.181 – 10.2.75.182	10.2.75.183
111	10.2.75.184/30	10.2.75.185 – 10.2.75.186	10.2.75.187
112	10.2.75.188/30	10.2.75.189 – 10.2.75.190	10.2.75.191
113	10.2.75.192/30	10.2.75.193 – 10.2.75.194	10.2.75.195
114	10.2.75.196/30	10.2.75.197 – 10.2.75.198	10.2.75.199
115	10.2.75.200/30	10.2.75.201 – 10.2.75.202	10.2.75.203
116	10.2.75.204/30	10.2.75.205 – 10.2.75.206	10.2.75.207
117	10.2.75.208/30	10.2.75.209 – 10.2.75.210	10.2.75.211
118	10.2.75.212/30	10.2.75.213 – 10.2.75.214	10.2.75.215
119	10.2.75.216/30	10.2.75.217 – 10.2.75.218	10.2.75.219
120	10.2.75.220/30	10.2.75.221 – 10.2.75.222	10.2.75.223
121	10.2.75.224/30	10.2.75.225 – 10.2.75.226	10.2.75.227
122	10.2.75.228/30	10.2.75.229 – 10.2.75.230	10.2.75.231
123	10.2.75.232/30	10.2.75.233 – 10.2.75.234	10.2.75.235
124	10.2.75.236/30	10.2.75.237 – 10.2.75.238	10.2.75.239
125	10.2.75.240/30	10.2.75.241 – 10.2.75.242	10.2.75.243
126	10.2.75.244/30	10.2.75.245 – 10.2.75.246	10.2.75.247
127	10.2.75.248/30	10.2.75.249 – 10.2.75.250	10.2.75.251
128	10.2.75.252/30	10.2.75.253 – 10.2.75.254	10.2.75.255

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 →