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)10.3.154.0/25

network10.3.154.0/25

broadcast10.3.154.127

first host10.3.154.1

last host10.3.154.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.154.0/25

address00001010.00000011.10011010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.10011010.00000000

broadcast00001010.00000011.10011010.01111111

green = network part, grey = host part

hex0x0a039a00

decimal168008192

reverse dns0.154.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:9a00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.154.0/32	10.3.154.0 – 10.3.154.0	10.3.154.0
2	10.3.154.1/32	10.3.154.1 – 10.3.154.1	10.3.154.1
3	10.3.154.2/32	10.3.154.2 – 10.3.154.2	10.3.154.2
4	10.3.154.3/32	10.3.154.3 – 10.3.154.3	10.3.154.3
5	10.3.154.4/32	10.3.154.4 – 10.3.154.4	10.3.154.4
6	10.3.154.5/32	10.3.154.5 – 10.3.154.5	10.3.154.5
7	10.3.154.6/32	10.3.154.6 – 10.3.154.6	10.3.154.6
8	10.3.154.7/32	10.3.154.7 – 10.3.154.7	10.3.154.7
9	10.3.154.8/32	10.3.154.8 – 10.3.154.8	10.3.154.8
10	10.3.154.9/32	10.3.154.9 – 10.3.154.9	10.3.154.9
11	10.3.154.10/32	10.3.154.10 – 10.3.154.10	10.3.154.10
12	10.3.154.11/32	10.3.154.11 – 10.3.154.11	10.3.154.11
13	10.3.154.12/32	10.3.154.12 – 10.3.154.12	10.3.154.12
14	10.3.154.13/32	10.3.154.13 – 10.3.154.13	10.3.154.13
15	10.3.154.14/32	10.3.154.14 – 10.3.154.14	10.3.154.14
16	10.3.154.15/32	10.3.154.15 – 10.3.154.15	10.3.154.15
17	10.3.154.16/32	10.3.154.16 – 10.3.154.16	10.3.154.16
18	10.3.154.17/32	10.3.154.17 – 10.3.154.17	10.3.154.17
19	10.3.154.18/32	10.3.154.18 – 10.3.154.18	10.3.154.18
20	10.3.154.19/32	10.3.154.19 – 10.3.154.19	10.3.154.19
21	10.3.154.20/32	10.3.154.20 – 10.3.154.20	10.3.154.20
22	10.3.154.21/32	10.3.154.21 – 10.3.154.21	10.3.154.21
23	10.3.154.22/32	10.3.154.22 – 10.3.154.22	10.3.154.22
24	10.3.154.23/32	10.3.154.23 – 10.3.154.23	10.3.154.23
25	10.3.154.24/32	10.3.154.24 – 10.3.154.24	10.3.154.24
26	10.3.154.25/32	10.3.154.25 – 10.3.154.25	10.3.154.25
27	10.3.154.26/32	10.3.154.26 – 10.3.154.26	10.3.154.26
28	10.3.154.27/32	10.3.154.27 – 10.3.154.27	10.3.154.27
29	10.3.154.28/32	10.3.154.28 – 10.3.154.28	10.3.154.28
30	10.3.154.29/32	10.3.154.29 – 10.3.154.29	10.3.154.29
31	10.3.154.30/32	10.3.154.30 – 10.3.154.30	10.3.154.30
32	10.3.154.31/32	10.3.154.31 – 10.3.154.31	10.3.154.31
33	10.3.154.32/32	10.3.154.32 – 10.3.154.32	10.3.154.32
34	10.3.154.33/32	10.3.154.33 – 10.3.154.33	10.3.154.33
35	10.3.154.34/32	10.3.154.34 – 10.3.154.34	10.3.154.34
36	10.3.154.35/32	10.3.154.35 – 10.3.154.35	10.3.154.35
37	10.3.154.36/32	10.3.154.36 – 10.3.154.36	10.3.154.36
38	10.3.154.37/32	10.3.154.37 – 10.3.154.37	10.3.154.37
39	10.3.154.38/32	10.3.154.38 – 10.3.154.38	10.3.154.38
40	10.3.154.39/32	10.3.154.39 – 10.3.154.39	10.3.154.39
41	10.3.154.40/32	10.3.154.40 – 10.3.154.40	10.3.154.40
42	10.3.154.41/32	10.3.154.41 – 10.3.154.41	10.3.154.41
43	10.3.154.42/32	10.3.154.42 – 10.3.154.42	10.3.154.42
44	10.3.154.43/32	10.3.154.43 – 10.3.154.43	10.3.154.43
45	10.3.154.44/32	10.3.154.44 – 10.3.154.44	10.3.154.44
46	10.3.154.45/32	10.3.154.45 – 10.3.154.45	10.3.154.45
47	10.3.154.46/32	10.3.154.46 – 10.3.154.46	10.3.154.46
48	10.3.154.47/32	10.3.154.47 – 10.3.154.47	10.3.154.47
49	10.3.154.48/32	10.3.154.48 – 10.3.154.48	10.3.154.48
50	10.3.154.49/32	10.3.154.49 – 10.3.154.49	10.3.154.49
51	10.3.154.50/32	10.3.154.50 – 10.3.154.50	10.3.154.50
52	10.3.154.51/32	10.3.154.51 – 10.3.154.51	10.3.154.51
53	10.3.154.52/32	10.3.154.52 – 10.3.154.52	10.3.154.52
54	10.3.154.53/32	10.3.154.53 – 10.3.154.53	10.3.154.53
55	10.3.154.54/32	10.3.154.54 – 10.3.154.54	10.3.154.54
56	10.3.154.55/32	10.3.154.55 – 10.3.154.55	10.3.154.55
57	10.3.154.56/32	10.3.154.56 – 10.3.154.56	10.3.154.56
58	10.3.154.57/32	10.3.154.57 – 10.3.154.57	10.3.154.57
59	10.3.154.58/32	10.3.154.58 – 10.3.154.58	10.3.154.58
60	10.3.154.59/32	10.3.154.59 – 10.3.154.59	10.3.154.59
61	10.3.154.60/32	10.3.154.60 – 10.3.154.60	10.3.154.60
62	10.3.154.61/32	10.3.154.61 – 10.3.154.61	10.3.154.61
63	10.3.154.62/32	10.3.154.62 – 10.3.154.62	10.3.154.62
64	10.3.154.63/32	10.3.154.63 – 10.3.154.63	10.3.154.63
65	10.3.154.64/32	10.3.154.64 – 10.3.154.64	10.3.154.64
66	10.3.154.65/32	10.3.154.65 – 10.3.154.65	10.3.154.65
67	10.3.154.66/32	10.3.154.66 – 10.3.154.66	10.3.154.66
68	10.3.154.67/32	10.3.154.67 – 10.3.154.67	10.3.154.67
69	10.3.154.68/32	10.3.154.68 – 10.3.154.68	10.3.154.68
70	10.3.154.69/32	10.3.154.69 – 10.3.154.69	10.3.154.69
71	10.3.154.70/32	10.3.154.70 – 10.3.154.70	10.3.154.70
72	10.3.154.71/32	10.3.154.71 – 10.3.154.71	10.3.154.71
73	10.3.154.72/32	10.3.154.72 – 10.3.154.72	10.3.154.72
74	10.3.154.73/32	10.3.154.73 – 10.3.154.73	10.3.154.73
75	10.3.154.74/32	10.3.154.74 – 10.3.154.74	10.3.154.74
76	10.3.154.75/32	10.3.154.75 – 10.3.154.75	10.3.154.75
77	10.3.154.76/32	10.3.154.76 – 10.3.154.76	10.3.154.76
78	10.3.154.77/32	10.3.154.77 – 10.3.154.77	10.3.154.77
79	10.3.154.78/32	10.3.154.78 – 10.3.154.78	10.3.154.78
80	10.3.154.79/32	10.3.154.79 – 10.3.154.79	10.3.154.79
81	10.3.154.80/32	10.3.154.80 – 10.3.154.80	10.3.154.80
82	10.3.154.81/32	10.3.154.81 – 10.3.154.81	10.3.154.81
83	10.3.154.82/32	10.3.154.82 – 10.3.154.82	10.3.154.82
84	10.3.154.83/32	10.3.154.83 – 10.3.154.83	10.3.154.83
85	10.3.154.84/32	10.3.154.84 – 10.3.154.84	10.3.154.84
86	10.3.154.85/32	10.3.154.85 – 10.3.154.85	10.3.154.85
87	10.3.154.86/32	10.3.154.86 – 10.3.154.86	10.3.154.86
88	10.3.154.87/32	10.3.154.87 – 10.3.154.87	10.3.154.87
89	10.3.154.88/32	10.3.154.88 – 10.3.154.88	10.3.154.88
90	10.3.154.89/32	10.3.154.89 – 10.3.154.89	10.3.154.89
91	10.3.154.90/32	10.3.154.90 – 10.3.154.90	10.3.154.90
92	10.3.154.91/32	10.3.154.91 – 10.3.154.91	10.3.154.91
93	10.3.154.92/32	10.3.154.92 – 10.3.154.92	10.3.154.92
94	10.3.154.93/32	10.3.154.93 – 10.3.154.93	10.3.154.93
95	10.3.154.94/32	10.3.154.94 – 10.3.154.94	10.3.154.94
96	10.3.154.95/32	10.3.154.95 – 10.3.154.95	10.3.154.95
97	10.3.154.96/32	10.3.154.96 – 10.3.154.96	10.3.154.96
98	10.3.154.97/32	10.3.154.97 – 10.3.154.97	10.3.154.97
99	10.3.154.98/32	10.3.154.98 – 10.3.154.98	10.3.154.98
100	10.3.154.99/32	10.3.154.99 – 10.3.154.99	10.3.154.99
101	10.3.154.100/32	10.3.154.100 – 10.3.154.100	10.3.154.100
102	10.3.154.101/32	10.3.154.101 – 10.3.154.101	10.3.154.101
103	10.3.154.102/32	10.3.154.102 – 10.3.154.102	10.3.154.102
104	10.3.154.103/32	10.3.154.103 – 10.3.154.103	10.3.154.103
105	10.3.154.104/32	10.3.154.104 – 10.3.154.104	10.3.154.104
106	10.3.154.105/32	10.3.154.105 – 10.3.154.105	10.3.154.105
107	10.3.154.106/32	10.3.154.106 – 10.3.154.106	10.3.154.106
108	10.3.154.107/32	10.3.154.107 – 10.3.154.107	10.3.154.107
109	10.3.154.108/32	10.3.154.108 – 10.3.154.108	10.3.154.108
110	10.3.154.109/32	10.3.154.109 – 10.3.154.109	10.3.154.109
111	10.3.154.110/32	10.3.154.110 – 10.3.154.110	10.3.154.110
112	10.3.154.111/32	10.3.154.111 – 10.3.154.111	10.3.154.111
113	10.3.154.112/32	10.3.154.112 – 10.3.154.112	10.3.154.112
114	10.3.154.113/32	10.3.154.113 – 10.3.154.113	10.3.154.113
115	10.3.154.114/32	10.3.154.114 – 10.3.154.114	10.3.154.114
116	10.3.154.115/32	10.3.154.115 – 10.3.154.115	10.3.154.115
117	10.3.154.116/32	10.3.154.116 – 10.3.154.116	10.3.154.116
118	10.3.154.117/32	10.3.154.117 – 10.3.154.117	10.3.154.117
119	10.3.154.118/32	10.3.154.118 – 10.3.154.118	10.3.154.118
120	10.3.154.119/32	10.3.154.119 – 10.3.154.119	10.3.154.119
121	10.3.154.120/32	10.3.154.120 – 10.3.154.120	10.3.154.120
122	10.3.154.121/32	10.3.154.121 – 10.3.154.121	10.3.154.121
123	10.3.154.122/32	10.3.154.122 – 10.3.154.122	10.3.154.122
124	10.3.154.123/32	10.3.154.123 – 10.3.154.123	10.3.154.123
125	10.3.154.124/32	10.3.154.124 – 10.3.154.124	10.3.154.124
126	10.3.154.125/32	10.3.154.125 – 10.3.154.125	10.3.154.125
127	10.3.154.126/32	10.3.154.126 – 10.3.154.126	10.3.154.126
128	10.3.154.127/32	10.3.154.127 – 10.3.154.127	10.3.154.127

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 →