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)10.2.175.0/25

network10.2.175.0/25

broadcast10.2.175.127

first host10.2.175.1

last host10.2.175.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.175.0/25

address00001010.00000010.10101111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10101111.00000000

broadcast00001010.00000010.10101111.01111111

green = network part, grey = host part

hex0x0a02af00

decimal167948032

reverse dns0.175.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:af00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.175.0/32	10.2.175.0 – 10.2.175.0	10.2.175.0
2	10.2.175.1/32	10.2.175.1 – 10.2.175.1	10.2.175.1
3	10.2.175.2/32	10.2.175.2 – 10.2.175.2	10.2.175.2
4	10.2.175.3/32	10.2.175.3 – 10.2.175.3	10.2.175.3
5	10.2.175.4/32	10.2.175.4 – 10.2.175.4	10.2.175.4
6	10.2.175.5/32	10.2.175.5 – 10.2.175.5	10.2.175.5
7	10.2.175.6/32	10.2.175.6 – 10.2.175.6	10.2.175.6
8	10.2.175.7/32	10.2.175.7 – 10.2.175.7	10.2.175.7
9	10.2.175.8/32	10.2.175.8 – 10.2.175.8	10.2.175.8
10	10.2.175.9/32	10.2.175.9 – 10.2.175.9	10.2.175.9
11	10.2.175.10/32	10.2.175.10 – 10.2.175.10	10.2.175.10
12	10.2.175.11/32	10.2.175.11 – 10.2.175.11	10.2.175.11
13	10.2.175.12/32	10.2.175.12 – 10.2.175.12	10.2.175.12
14	10.2.175.13/32	10.2.175.13 – 10.2.175.13	10.2.175.13
15	10.2.175.14/32	10.2.175.14 – 10.2.175.14	10.2.175.14
16	10.2.175.15/32	10.2.175.15 – 10.2.175.15	10.2.175.15
17	10.2.175.16/32	10.2.175.16 – 10.2.175.16	10.2.175.16
18	10.2.175.17/32	10.2.175.17 – 10.2.175.17	10.2.175.17
19	10.2.175.18/32	10.2.175.18 – 10.2.175.18	10.2.175.18
20	10.2.175.19/32	10.2.175.19 – 10.2.175.19	10.2.175.19
21	10.2.175.20/32	10.2.175.20 – 10.2.175.20	10.2.175.20
22	10.2.175.21/32	10.2.175.21 – 10.2.175.21	10.2.175.21
23	10.2.175.22/32	10.2.175.22 – 10.2.175.22	10.2.175.22
24	10.2.175.23/32	10.2.175.23 – 10.2.175.23	10.2.175.23
25	10.2.175.24/32	10.2.175.24 – 10.2.175.24	10.2.175.24
26	10.2.175.25/32	10.2.175.25 – 10.2.175.25	10.2.175.25
27	10.2.175.26/32	10.2.175.26 – 10.2.175.26	10.2.175.26
28	10.2.175.27/32	10.2.175.27 – 10.2.175.27	10.2.175.27
29	10.2.175.28/32	10.2.175.28 – 10.2.175.28	10.2.175.28
30	10.2.175.29/32	10.2.175.29 – 10.2.175.29	10.2.175.29
31	10.2.175.30/32	10.2.175.30 – 10.2.175.30	10.2.175.30
32	10.2.175.31/32	10.2.175.31 – 10.2.175.31	10.2.175.31
33	10.2.175.32/32	10.2.175.32 – 10.2.175.32	10.2.175.32
34	10.2.175.33/32	10.2.175.33 – 10.2.175.33	10.2.175.33
35	10.2.175.34/32	10.2.175.34 – 10.2.175.34	10.2.175.34
36	10.2.175.35/32	10.2.175.35 – 10.2.175.35	10.2.175.35
37	10.2.175.36/32	10.2.175.36 – 10.2.175.36	10.2.175.36
38	10.2.175.37/32	10.2.175.37 – 10.2.175.37	10.2.175.37
39	10.2.175.38/32	10.2.175.38 – 10.2.175.38	10.2.175.38
40	10.2.175.39/32	10.2.175.39 – 10.2.175.39	10.2.175.39
41	10.2.175.40/32	10.2.175.40 – 10.2.175.40	10.2.175.40
42	10.2.175.41/32	10.2.175.41 – 10.2.175.41	10.2.175.41
43	10.2.175.42/32	10.2.175.42 – 10.2.175.42	10.2.175.42
44	10.2.175.43/32	10.2.175.43 – 10.2.175.43	10.2.175.43
45	10.2.175.44/32	10.2.175.44 – 10.2.175.44	10.2.175.44
46	10.2.175.45/32	10.2.175.45 – 10.2.175.45	10.2.175.45
47	10.2.175.46/32	10.2.175.46 – 10.2.175.46	10.2.175.46
48	10.2.175.47/32	10.2.175.47 – 10.2.175.47	10.2.175.47
49	10.2.175.48/32	10.2.175.48 – 10.2.175.48	10.2.175.48
50	10.2.175.49/32	10.2.175.49 – 10.2.175.49	10.2.175.49
51	10.2.175.50/32	10.2.175.50 – 10.2.175.50	10.2.175.50
52	10.2.175.51/32	10.2.175.51 – 10.2.175.51	10.2.175.51
53	10.2.175.52/32	10.2.175.52 – 10.2.175.52	10.2.175.52
54	10.2.175.53/32	10.2.175.53 – 10.2.175.53	10.2.175.53
55	10.2.175.54/32	10.2.175.54 – 10.2.175.54	10.2.175.54
56	10.2.175.55/32	10.2.175.55 – 10.2.175.55	10.2.175.55
57	10.2.175.56/32	10.2.175.56 – 10.2.175.56	10.2.175.56
58	10.2.175.57/32	10.2.175.57 – 10.2.175.57	10.2.175.57
59	10.2.175.58/32	10.2.175.58 – 10.2.175.58	10.2.175.58
60	10.2.175.59/32	10.2.175.59 – 10.2.175.59	10.2.175.59
61	10.2.175.60/32	10.2.175.60 – 10.2.175.60	10.2.175.60
62	10.2.175.61/32	10.2.175.61 – 10.2.175.61	10.2.175.61
63	10.2.175.62/32	10.2.175.62 – 10.2.175.62	10.2.175.62
64	10.2.175.63/32	10.2.175.63 – 10.2.175.63	10.2.175.63
65	10.2.175.64/32	10.2.175.64 – 10.2.175.64	10.2.175.64
66	10.2.175.65/32	10.2.175.65 – 10.2.175.65	10.2.175.65
67	10.2.175.66/32	10.2.175.66 – 10.2.175.66	10.2.175.66
68	10.2.175.67/32	10.2.175.67 – 10.2.175.67	10.2.175.67
69	10.2.175.68/32	10.2.175.68 – 10.2.175.68	10.2.175.68
70	10.2.175.69/32	10.2.175.69 – 10.2.175.69	10.2.175.69
71	10.2.175.70/32	10.2.175.70 – 10.2.175.70	10.2.175.70
72	10.2.175.71/32	10.2.175.71 – 10.2.175.71	10.2.175.71
73	10.2.175.72/32	10.2.175.72 – 10.2.175.72	10.2.175.72
74	10.2.175.73/32	10.2.175.73 – 10.2.175.73	10.2.175.73
75	10.2.175.74/32	10.2.175.74 – 10.2.175.74	10.2.175.74
76	10.2.175.75/32	10.2.175.75 – 10.2.175.75	10.2.175.75
77	10.2.175.76/32	10.2.175.76 – 10.2.175.76	10.2.175.76
78	10.2.175.77/32	10.2.175.77 – 10.2.175.77	10.2.175.77
79	10.2.175.78/32	10.2.175.78 – 10.2.175.78	10.2.175.78
80	10.2.175.79/32	10.2.175.79 – 10.2.175.79	10.2.175.79
81	10.2.175.80/32	10.2.175.80 – 10.2.175.80	10.2.175.80
82	10.2.175.81/32	10.2.175.81 – 10.2.175.81	10.2.175.81
83	10.2.175.82/32	10.2.175.82 – 10.2.175.82	10.2.175.82
84	10.2.175.83/32	10.2.175.83 – 10.2.175.83	10.2.175.83
85	10.2.175.84/32	10.2.175.84 – 10.2.175.84	10.2.175.84
86	10.2.175.85/32	10.2.175.85 – 10.2.175.85	10.2.175.85
87	10.2.175.86/32	10.2.175.86 – 10.2.175.86	10.2.175.86
88	10.2.175.87/32	10.2.175.87 – 10.2.175.87	10.2.175.87
89	10.2.175.88/32	10.2.175.88 – 10.2.175.88	10.2.175.88
90	10.2.175.89/32	10.2.175.89 – 10.2.175.89	10.2.175.89
91	10.2.175.90/32	10.2.175.90 – 10.2.175.90	10.2.175.90
92	10.2.175.91/32	10.2.175.91 – 10.2.175.91	10.2.175.91
93	10.2.175.92/32	10.2.175.92 – 10.2.175.92	10.2.175.92
94	10.2.175.93/32	10.2.175.93 – 10.2.175.93	10.2.175.93
95	10.2.175.94/32	10.2.175.94 – 10.2.175.94	10.2.175.94
96	10.2.175.95/32	10.2.175.95 – 10.2.175.95	10.2.175.95
97	10.2.175.96/32	10.2.175.96 – 10.2.175.96	10.2.175.96
98	10.2.175.97/32	10.2.175.97 – 10.2.175.97	10.2.175.97
99	10.2.175.98/32	10.2.175.98 – 10.2.175.98	10.2.175.98
100	10.2.175.99/32	10.2.175.99 – 10.2.175.99	10.2.175.99
101	10.2.175.100/32	10.2.175.100 – 10.2.175.100	10.2.175.100
102	10.2.175.101/32	10.2.175.101 – 10.2.175.101	10.2.175.101
103	10.2.175.102/32	10.2.175.102 – 10.2.175.102	10.2.175.102
104	10.2.175.103/32	10.2.175.103 – 10.2.175.103	10.2.175.103
105	10.2.175.104/32	10.2.175.104 – 10.2.175.104	10.2.175.104
106	10.2.175.105/32	10.2.175.105 – 10.2.175.105	10.2.175.105
107	10.2.175.106/32	10.2.175.106 – 10.2.175.106	10.2.175.106
108	10.2.175.107/32	10.2.175.107 – 10.2.175.107	10.2.175.107
109	10.2.175.108/32	10.2.175.108 – 10.2.175.108	10.2.175.108
110	10.2.175.109/32	10.2.175.109 – 10.2.175.109	10.2.175.109
111	10.2.175.110/32	10.2.175.110 – 10.2.175.110	10.2.175.110
112	10.2.175.111/32	10.2.175.111 – 10.2.175.111	10.2.175.111
113	10.2.175.112/32	10.2.175.112 – 10.2.175.112	10.2.175.112
114	10.2.175.113/32	10.2.175.113 – 10.2.175.113	10.2.175.113
115	10.2.175.114/32	10.2.175.114 – 10.2.175.114	10.2.175.114
116	10.2.175.115/32	10.2.175.115 – 10.2.175.115	10.2.175.115
117	10.2.175.116/32	10.2.175.116 – 10.2.175.116	10.2.175.116
118	10.2.175.117/32	10.2.175.117 – 10.2.175.117	10.2.175.117
119	10.2.175.118/32	10.2.175.118 – 10.2.175.118	10.2.175.118
120	10.2.175.119/32	10.2.175.119 – 10.2.175.119	10.2.175.119
121	10.2.175.120/32	10.2.175.120 – 10.2.175.120	10.2.175.120
122	10.2.175.121/32	10.2.175.121 – 10.2.175.121	10.2.175.121
123	10.2.175.122/32	10.2.175.122 – 10.2.175.122	10.2.175.122
124	10.2.175.123/32	10.2.175.123 – 10.2.175.123	10.2.175.123
125	10.2.175.124/32	10.2.175.124 – 10.2.175.124	10.2.175.124
126	10.2.175.125/32	10.2.175.125 – 10.2.175.125	10.2.175.125
127	10.2.175.126/32	10.2.175.126 – 10.2.175.126	10.2.175.126
128	10.2.175.127/32	10.2.175.127 – 10.2.175.127	10.2.175.127

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 →