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)10.167.221.0/25

network10.167.221.0/25

broadcast10.167.221.127

first host10.167.221.1

last host10.167.221.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.221.0/25

address00001010.10100111.11011101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.11011101.00000000

broadcast00001010.10100111.11011101.01111111

green = network part, grey = host part

hex0x0aa7dd00

decimal178773248

reverse dns0.221.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:dd00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.221.0/32	10.167.221.0 – 10.167.221.0	10.167.221.0
2	10.167.221.1/32	10.167.221.1 – 10.167.221.1	10.167.221.1
3	10.167.221.2/32	10.167.221.2 – 10.167.221.2	10.167.221.2
4	10.167.221.3/32	10.167.221.3 – 10.167.221.3	10.167.221.3
5	10.167.221.4/32	10.167.221.4 – 10.167.221.4	10.167.221.4
6	10.167.221.5/32	10.167.221.5 – 10.167.221.5	10.167.221.5
7	10.167.221.6/32	10.167.221.6 – 10.167.221.6	10.167.221.6
8	10.167.221.7/32	10.167.221.7 – 10.167.221.7	10.167.221.7
9	10.167.221.8/32	10.167.221.8 – 10.167.221.8	10.167.221.8
10	10.167.221.9/32	10.167.221.9 – 10.167.221.9	10.167.221.9
11	10.167.221.10/32	10.167.221.10 – 10.167.221.10	10.167.221.10
12	10.167.221.11/32	10.167.221.11 – 10.167.221.11	10.167.221.11
13	10.167.221.12/32	10.167.221.12 – 10.167.221.12	10.167.221.12
14	10.167.221.13/32	10.167.221.13 – 10.167.221.13	10.167.221.13
15	10.167.221.14/32	10.167.221.14 – 10.167.221.14	10.167.221.14
16	10.167.221.15/32	10.167.221.15 – 10.167.221.15	10.167.221.15
17	10.167.221.16/32	10.167.221.16 – 10.167.221.16	10.167.221.16
18	10.167.221.17/32	10.167.221.17 – 10.167.221.17	10.167.221.17
19	10.167.221.18/32	10.167.221.18 – 10.167.221.18	10.167.221.18
20	10.167.221.19/32	10.167.221.19 – 10.167.221.19	10.167.221.19
21	10.167.221.20/32	10.167.221.20 – 10.167.221.20	10.167.221.20
22	10.167.221.21/32	10.167.221.21 – 10.167.221.21	10.167.221.21
23	10.167.221.22/32	10.167.221.22 – 10.167.221.22	10.167.221.22
24	10.167.221.23/32	10.167.221.23 – 10.167.221.23	10.167.221.23
25	10.167.221.24/32	10.167.221.24 – 10.167.221.24	10.167.221.24
26	10.167.221.25/32	10.167.221.25 – 10.167.221.25	10.167.221.25
27	10.167.221.26/32	10.167.221.26 – 10.167.221.26	10.167.221.26
28	10.167.221.27/32	10.167.221.27 – 10.167.221.27	10.167.221.27
29	10.167.221.28/32	10.167.221.28 – 10.167.221.28	10.167.221.28
30	10.167.221.29/32	10.167.221.29 – 10.167.221.29	10.167.221.29
31	10.167.221.30/32	10.167.221.30 – 10.167.221.30	10.167.221.30
32	10.167.221.31/32	10.167.221.31 – 10.167.221.31	10.167.221.31
33	10.167.221.32/32	10.167.221.32 – 10.167.221.32	10.167.221.32
34	10.167.221.33/32	10.167.221.33 – 10.167.221.33	10.167.221.33
35	10.167.221.34/32	10.167.221.34 – 10.167.221.34	10.167.221.34
36	10.167.221.35/32	10.167.221.35 – 10.167.221.35	10.167.221.35
37	10.167.221.36/32	10.167.221.36 – 10.167.221.36	10.167.221.36
38	10.167.221.37/32	10.167.221.37 – 10.167.221.37	10.167.221.37
39	10.167.221.38/32	10.167.221.38 – 10.167.221.38	10.167.221.38
40	10.167.221.39/32	10.167.221.39 – 10.167.221.39	10.167.221.39
41	10.167.221.40/32	10.167.221.40 – 10.167.221.40	10.167.221.40
42	10.167.221.41/32	10.167.221.41 – 10.167.221.41	10.167.221.41
43	10.167.221.42/32	10.167.221.42 – 10.167.221.42	10.167.221.42
44	10.167.221.43/32	10.167.221.43 – 10.167.221.43	10.167.221.43
45	10.167.221.44/32	10.167.221.44 – 10.167.221.44	10.167.221.44
46	10.167.221.45/32	10.167.221.45 – 10.167.221.45	10.167.221.45
47	10.167.221.46/32	10.167.221.46 – 10.167.221.46	10.167.221.46
48	10.167.221.47/32	10.167.221.47 – 10.167.221.47	10.167.221.47
49	10.167.221.48/32	10.167.221.48 – 10.167.221.48	10.167.221.48
50	10.167.221.49/32	10.167.221.49 – 10.167.221.49	10.167.221.49
51	10.167.221.50/32	10.167.221.50 – 10.167.221.50	10.167.221.50
52	10.167.221.51/32	10.167.221.51 – 10.167.221.51	10.167.221.51
53	10.167.221.52/32	10.167.221.52 – 10.167.221.52	10.167.221.52
54	10.167.221.53/32	10.167.221.53 – 10.167.221.53	10.167.221.53
55	10.167.221.54/32	10.167.221.54 – 10.167.221.54	10.167.221.54
56	10.167.221.55/32	10.167.221.55 – 10.167.221.55	10.167.221.55
57	10.167.221.56/32	10.167.221.56 – 10.167.221.56	10.167.221.56
58	10.167.221.57/32	10.167.221.57 – 10.167.221.57	10.167.221.57
59	10.167.221.58/32	10.167.221.58 – 10.167.221.58	10.167.221.58
60	10.167.221.59/32	10.167.221.59 – 10.167.221.59	10.167.221.59
61	10.167.221.60/32	10.167.221.60 – 10.167.221.60	10.167.221.60
62	10.167.221.61/32	10.167.221.61 – 10.167.221.61	10.167.221.61
63	10.167.221.62/32	10.167.221.62 – 10.167.221.62	10.167.221.62
64	10.167.221.63/32	10.167.221.63 – 10.167.221.63	10.167.221.63
65	10.167.221.64/32	10.167.221.64 – 10.167.221.64	10.167.221.64
66	10.167.221.65/32	10.167.221.65 – 10.167.221.65	10.167.221.65
67	10.167.221.66/32	10.167.221.66 – 10.167.221.66	10.167.221.66
68	10.167.221.67/32	10.167.221.67 – 10.167.221.67	10.167.221.67
69	10.167.221.68/32	10.167.221.68 – 10.167.221.68	10.167.221.68
70	10.167.221.69/32	10.167.221.69 – 10.167.221.69	10.167.221.69
71	10.167.221.70/32	10.167.221.70 – 10.167.221.70	10.167.221.70
72	10.167.221.71/32	10.167.221.71 – 10.167.221.71	10.167.221.71
73	10.167.221.72/32	10.167.221.72 – 10.167.221.72	10.167.221.72
74	10.167.221.73/32	10.167.221.73 – 10.167.221.73	10.167.221.73
75	10.167.221.74/32	10.167.221.74 – 10.167.221.74	10.167.221.74
76	10.167.221.75/32	10.167.221.75 – 10.167.221.75	10.167.221.75
77	10.167.221.76/32	10.167.221.76 – 10.167.221.76	10.167.221.76
78	10.167.221.77/32	10.167.221.77 – 10.167.221.77	10.167.221.77
79	10.167.221.78/32	10.167.221.78 – 10.167.221.78	10.167.221.78
80	10.167.221.79/32	10.167.221.79 – 10.167.221.79	10.167.221.79
81	10.167.221.80/32	10.167.221.80 – 10.167.221.80	10.167.221.80
82	10.167.221.81/32	10.167.221.81 – 10.167.221.81	10.167.221.81
83	10.167.221.82/32	10.167.221.82 – 10.167.221.82	10.167.221.82
84	10.167.221.83/32	10.167.221.83 – 10.167.221.83	10.167.221.83
85	10.167.221.84/32	10.167.221.84 – 10.167.221.84	10.167.221.84
86	10.167.221.85/32	10.167.221.85 – 10.167.221.85	10.167.221.85
87	10.167.221.86/32	10.167.221.86 – 10.167.221.86	10.167.221.86
88	10.167.221.87/32	10.167.221.87 – 10.167.221.87	10.167.221.87
89	10.167.221.88/32	10.167.221.88 – 10.167.221.88	10.167.221.88
90	10.167.221.89/32	10.167.221.89 – 10.167.221.89	10.167.221.89
91	10.167.221.90/32	10.167.221.90 – 10.167.221.90	10.167.221.90
92	10.167.221.91/32	10.167.221.91 – 10.167.221.91	10.167.221.91
93	10.167.221.92/32	10.167.221.92 – 10.167.221.92	10.167.221.92
94	10.167.221.93/32	10.167.221.93 – 10.167.221.93	10.167.221.93
95	10.167.221.94/32	10.167.221.94 – 10.167.221.94	10.167.221.94
96	10.167.221.95/32	10.167.221.95 – 10.167.221.95	10.167.221.95
97	10.167.221.96/32	10.167.221.96 – 10.167.221.96	10.167.221.96
98	10.167.221.97/32	10.167.221.97 – 10.167.221.97	10.167.221.97
99	10.167.221.98/32	10.167.221.98 – 10.167.221.98	10.167.221.98
100	10.167.221.99/32	10.167.221.99 – 10.167.221.99	10.167.221.99
101	10.167.221.100/32	10.167.221.100 – 10.167.221.100	10.167.221.100
102	10.167.221.101/32	10.167.221.101 – 10.167.221.101	10.167.221.101
103	10.167.221.102/32	10.167.221.102 – 10.167.221.102	10.167.221.102
104	10.167.221.103/32	10.167.221.103 – 10.167.221.103	10.167.221.103
105	10.167.221.104/32	10.167.221.104 – 10.167.221.104	10.167.221.104
106	10.167.221.105/32	10.167.221.105 – 10.167.221.105	10.167.221.105
107	10.167.221.106/32	10.167.221.106 – 10.167.221.106	10.167.221.106
108	10.167.221.107/32	10.167.221.107 – 10.167.221.107	10.167.221.107
109	10.167.221.108/32	10.167.221.108 – 10.167.221.108	10.167.221.108
110	10.167.221.109/32	10.167.221.109 – 10.167.221.109	10.167.221.109
111	10.167.221.110/32	10.167.221.110 – 10.167.221.110	10.167.221.110
112	10.167.221.111/32	10.167.221.111 – 10.167.221.111	10.167.221.111
113	10.167.221.112/32	10.167.221.112 – 10.167.221.112	10.167.221.112
114	10.167.221.113/32	10.167.221.113 – 10.167.221.113	10.167.221.113
115	10.167.221.114/32	10.167.221.114 – 10.167.221.114	10.167.221.114
116	10.167.221.115/32	10.167.221.115 – 10.167.221.115	10.167.221.115
117	10.167.221.116/32	10.167.221.116 – 10.167.221.116	10.167.221.116
118	10.167.221.117/32	10.167.221.117 – 10.167.221.117	10.167.221.117
119	10.167.221.118/32	10.167.221.118 – 10.167.221.118	10.167.221.118
120	10.167.221.119/32	10.167.221.119 – 10.167.221.119	10.167.221.119
121	10.167.221.120/32	10.167.221.120 – 10.167.221.120	10.167.221.120
122	10.167.221.121/32	10.167.221.121 – 10.167.221.121	10.167.221.121
123	10.167.221.122/32	10.167.221.122 – 10.167.221.122	10.167.221.122
124	10.167.221.123/32	10.167.221.123 – 10.167.221.123	10.167.221.123
125	10.167.221.124/32	10.167.221.124 – 10.167.221.124	10.167.221.124
126	10.167.221.125/32	10.167.221.125 – 10.167.221.125	10.167.221.125
127	10.167.221.126/32	10.167.221.126 – 10.167.221.126	10.167.221.126
128	10.167.221.127/32	10.167.221.127 – 10.167.221.127	10.167.221.127

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