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)10.3.157.0/25

network10.3.157.0/25

broadcast10.3.157.127

first host10.3.157.1

last host10.3.157.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.157.0/25

address00001010.00000011.10011101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.10011101.00000000

broadcast00001010.00000011.10011101.01111111

green = network part, grey = host part

hex0x0a039d00

decimal168008960

reverse dns0.157.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:9d00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.157.0/32	10.3.157.0 – 10.3.157.0	10.3.157.0
2	10.3.157.1/32	10.3.157.1 – 10.3.157.1	10.3.157.1
3	10.3.157.2/32	10.3.157.2 – 10.3.157.2	10.3.157.2
4	10.3.157.3/32	10.3.157.3 – 10.3.157.3	10.3.157.3
5	10.3.157.4/32	10.3.157.4 – 10.3.157.4	10.3.157.4
6	10.3.157.5/32	10.3.157.5 – 10.3.157.5	10.3.157.5
7	10.3.157.6/32	10.3.157.6 – 10.3.157.6	10.3.157.6
8	10.3.157.7/32	10.3.157.7 – 10.3.157.7	10.3.157.7
9	10.3.157.8/32	10.3.157.8 – 10.3.157.8	10.3.157.8
10	10.3.157.9/32	10.3.157.9 – 10.3.157.9	10.3.157.9
11	10.3.157.10/32	10.3.157.10 – 10.3.157.10	10.3.157.10
12	10.3.157.11/32	10.3.157.11 – 10.3.157.11	10.3.157.11
13	10.3.157.12/32	10.3.157.12 – 10.3.157.12	10.3.157.12
14	10.3.157.13/32	10.3.157.13 – 10.3.157.13	10.3.157.13
15	10.3.157.14/32	10.3.157.14 – 10.3.157.14	10.3.157.14
16	10.3.157.15/32	10.3.157.15 – 10.3.157.15	10.3.157.15
17	10.3.157.16/32	10.3.157.16 – 10.3.157.16	10.3.157.16
18	10.3.157.17/32	10.3.157.17 – 10.3.157.17	10.3.157.17
19	10.3.157.18/32	10.3.157.18 – 10.3.157.18	10.3.157.18
20	10.3.157.19/32	10.3.157.19 – 10.3.157.19	10.3.157.19
21	10.3.157.20/32	10.3.157.20 – 10.3.157.20	10.3.157.20
22	10.3.157.21/32	10.3.157.21 – 10.3.157.21	10.3.157.21
23	10.3.157.22/32	10.3.157.22 – 10.3.157.22	10.3.157.22
24	10.3.157.23/32	10.3.157.23 – 10.3.157.23	10.3.157.23
25	10.3.157.24/32	10.3.157.24 – 10.3.157.24	10.3.157.24
26	10.3.157.25/32	10.3.157.25 – 10.3.157.25	10.3.157.25
27	10.3.157.26/32	10.3.157.26 – 10.3.157.26	10.3.157.26
28	10.3.157.27/32	10.3.157.27 – 10.3.157.27	10.3.157.27
29	10.3.157.28/32	10.3.157.28 – 10.3.157.28	10.3.157.28
30	10.3.157.29/32	10.3.157.29 – 10.3.157.29	10.3.157.29
31	10.3.157.30/32	10.3.157.30 – 10.3.157.30	10.3.157.30
32	10.3.157.31/32	10.3.157.31 – 10.3.157.31	10.3.157.31
33	10.3.157.32/32	10.3.157.32 – 10.3.157.32	10.3.157.32
34	10.3.157.33/32	10.3.157.33 – 10.3.157.33	10.3.157.33
35	10.3.157.34/32	10.3.157.34 – 10.3.157.34	10.3.157.34
36	10.3.157.35/32	10.3.157.35 – 10.3.157.35	10.3.157.35
37	10.3.157.36/32	10.3.157.36 – 10.3.157.36	10.3.157.36
38	10.3.157.37/32	10.3.157.37 – 10.3.157.37	10.3.157.37
39	10.3.157.38/32	10.3.157.38 – 10.3.157.38	10.3.157.38
40	10.3.157.39/32	10.3.157.39 – 10.3.157.39	10.3.157.39
41	10.3.157.40/32	10.3.157.40 – 10.3.157.40	10.3.157.40
42	10.3.157.41/32	10.3.157.41 – 10.3.157.41	10.3.157.41
43	10.3.157.42/32	10.3.157.42 – 10.3.157.42	10.3.157.42
44	10.3.157.43/32	10.3.157.43 – 10.3.157.43	10.3.157.43
45	10.3.157.44/32	10.3.157.44 – 10.3.157.44	10.3.157.44
46	10.3.157.45/32	10.3.157.45 – 10.3.157.45	10.3.157.45
47	10.3.157.46/32	10.3.157.46 – 10.3.157.46	10.3.157.46
48	10.3.157.47/32	10.3.157.47 – 10.3.157.47	10.3.157.47
49	10.3.157.48/32	10.3.157.48 – 10.3.157.48	10.3.157.48
50	10.3.157.49/32	10.3.157.49 – 10.3.157.49	10.3.157.49
51	10.3.157.50/32	10.3.157.50 – 10.3.157.50	10.3.157.50
52	10.3.157.51/32	10.3.157.51 – 10.3.157.51	10.3.157.51
53	10.3.157.52/32	10.3.157.52 – 10.3.157.52	10.3.157.52
54	10.3.157.53/32	10.3.157.53 – 10.3.157.53	10.3.157.53
55	10.3.157.54/32	10.3.157.54 – 10.3.157.54	10.3.157.54
56	10.3.157.55/32	10.3.157.55 – 10.3.157.55	10.3.157.55
57	10.3.157.56/32	10.3.157.56 – 10.3.157.56	10.3.157.56
58	10.3.157.57/32	10.3.157.57 – 10.3.157.57	10.3.157.57
59	10.3.157.58/32	10.3.157.58 – 10.3.157.58	10.3.157.58
60	10.3.157.59/32	10.3.157.59 – 10.3.157.59	10.3.157.59
61	10.3.157.60/32	10.3.157.60 – 10.3.157.60	10.3.157.60
62	10.3.157.61/32	10.3.157.61 – 10.3.157.61	10.3.157.61
63	10.3.157.62/32	10.3.157.62 – 10.3.157.62	10.3.157.62
64	10.3.157.63/32	10.3.157.63 – 10.3.157.63	10.3.157.63
65	10.3.157.64/32	10.3.157.64 – 10.3.157.64	10.3.157.64
66	10.3.157.65/32	10.3.157.65 – 10.3.157.65	10.3.157.65
67	10.3.157.66/32	10.3.157.66 – 10.3.157.66	10.3.157.66
68	10.3.157.67/32	10.3.157.67 – 10.3.157.67	10.3.157.67
69	10.3.157.68/32	10.3.157.68 – 10.3.157.68	10.3.157.68
70	10.3.157.69/32	10.3.157.69 – 10.3.157.69	10.3.157.69
71	10.3.157.70/32	10.3.157.70 – 10.3.157.70	10.3.157.70
72	10.3.157.71/32	10.3.157.71 – 10.3.157.71	10.3.157.71
73	10.3.157.72/32	10.3.157.72 – 10.3.157.72	10.3.157.72
74	10.3.157.73/32	10.3.157.73 – 10.3.157.73	10.3.157.73
75	10.3.157.74/32	10.3.157.74 – 10.3.157.74	10.3.157.74
76	10.3.157.75/32	10.3.157.75 – 10.3.157.75	10.3.157.75
77	10.3.157.76/32	10.3.157.76 – 10.3.157.76	10.3.157.76
78	10.3.157.77/32	10.3.157.77 – 10.3.157.77	10.3.157.77
79	10.3.157.78/32	10.3.157.78 – 10.3.157.78	10.3.157.78
80	10.3.157.79/32	10.3.157.79 – 10.3.157.79	10.3.157.79
81	10.3.157.80/32	10.3.157.80 – 10.3.157.80	10.3.157.80
82	10.3.157.81/32	10.3.157.81 – 10.3.157.81	10.3.157.81
83	10.3.157.82/32	10.3.157.82 – 10.3.157.82	10.3.157.82
84	10.3.157.83/32	10.3.157.83 – 10.3.157.83	10.3.157.83
85	10.3.157.84/32	10.3.157.84 – 10.3.157.84	10.3.157.84
86	10.3.157.85/32	10.3.157.85 – 10.3.157.85	10.3.157.85
87	10.3.157.86/32	10.3.157.86 – 10.3.157.86	10.3.157.86
88	10.3.157.87/32	10.3.157.87 – 10.3.157.87	10.3.157.87
89	10.3.157.88/32	10.3.157.88 – 10.3.157.88	10.3.157.88
90	10.3.157.89/32	10.3.157.89 – 10.3.157.89	10.3.157.89
91	10.3.157.90/32	10.3.157.90 – 10.3.157.90	10.3.157.90
92	10.3.157.91/32	10.3.157.91 – 10.3.157.91	10.3.157.91
93	10.3.157.92/32	10.3.157.92 – 10.3.157.92	10.3.157.92
94	10.3.157.93/32	10.3.157.93 – 10.3.157.93	10.3.157.93
95	10.3.157.94/32	10.3.157.94 – 10.3.157.94	10.3.157.94
96	10.3.157.95/32	10.3.157.95 – 10.3.157.95	10.3.157.95
97	10.3.157.96/32	10.3.157.96 – 10.3.157.96	10.3.157.96
98	10.3.157.97/32	10.3.157.97 – 10.3.157.97	10.3.157.97
99	10.3.157.98/32	10.3.157.98 – 10.3.157.98	10.3.157.98
100	10.3.157.99/32	10.3.157.99 – 10.3.157.99	10.3.157.99
101	10.3.157.100/32	10.3.157.100 – 10.3.157.100	10.3.157.100
102	10.3.157.101/32	10.3.157.101 – 10.3.157.101	10.3.157.101
103	10.3.157.102/32	10.3.157.102 – 10.3.157.102	10.3.157.102
104	10.3.157.103/32	10.3.157.103 – 10.3.157.103	10.3.157.103
105	10.3.157.104/32	10.3.157.104 – 10.3.157.104	10.3.157.104
106	10.3.157.105/32	10.3.157.105 – 10.3.157.105	10.3.157.105
107	10.3.157.106/32	10.3.157.106 – 10.3.157.106	10.3.157.106
108	10.3.157.107/32	10.3.157.107 – 10.3.157.107	10.3.157.107
109	10.3.157.108/32	10.3.157.108 – 10.3.157.108	10.3.157.108
110	10.3.157.109/32	10.3.157.109 – 10.3.157.109	10.3.157.109
111	10.3.157.110/32	10.3.157.110 – 10.3.157.110	10.3.157.110
112	10.3.157.111/32	10.3.157.111 – 10.3.157.111	10.3.157.111
113	10.3.157.112/32	10.3.157.112 – 10.3.157.112	10.3.157.112
114	10.3.157.113/32	10.3.157.113 – 10.3.157.113	10.3.157.113
115	10.3.157.114/32	10.3.157.114 – 10.3.157.114	10.3.157.114
116	10.3.157.115/32	10.3.157.115 – 10.3.157.115	10.3.157.115
117	10.3.157.116/32	10.3.157.116 – 10.3.157.116	10.3.157.116
118	10.3.157.117/32	10.3.157.117 – 10.3.157.117	10.3.157.117
119	10.3.157.118/32	10.3.157.118 – 10.3.157.118	10.3.157.118
120	10.3.157.119/32	10.3.157.119 – 10.3.157.119	10.3.157.119
121	10.3.157.120/32	10.3.157.120 – 10.3.157.120	10.3.157.120
122	10.3.157.121/32	10.3.157.121 – 10.3.157.121	10.3.157.121
123	10.3.157.122/32	10.3.157.122 – 10.3.157.122	10.3.157.122
124	10.3.157.123/32	10.3.157.123 – 10.3.157.123	10.3.157.123
125	10.3.157.124/32	10.3.157.124 – 10.3.157.124	10.3.157.124
126	10.3.157.125/32	10.3.157.125 – 10.3.157.125	10.3.157.125
127	10.3.157.126/32	10.3.157.126 – 10.3.157.126	10.3.157.126
128	10.3.157.127/32	10.3.157.127 – 10.3.157.127	10.3.157.127

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 →