Everything in networking is based on bits → bytes → IP

What is a BIT?

👉 A bit is the smallest unit of data

bit = 0 or 1

• 0 = OFF
• 1 = ON

What is a BYTE?

👉 A byte = 8 bits

1 byte = 8 bits

Example:

10101010  → 1 byte

What is an OCTET?

👉 An octet = 8 bits (same as byte)

In networking, we say:

• byte → general computing
• octet → networking (IP addresses)

🎯 KEY IDEA

1 octet = 8 bits = numbers from 0 to 255

🎓 2. Why 0–255?

Because:

2^8 = 256

👉 So:

0 to 255 = 256 values

🎓 3. Structure of IP Address

Example:

192.168.1.10

This has 4 octets:

[192] [168] [1] [10]

Each one = 8 bits

Total:

4 × 8 = 32 bits

🎓 4. The “BOX METHOD” (This is what you asked)

This is how you convert numbers like 192 into bits

Step 1 — Draw boxes

Each octet has 8 boxes (bits)

128  64  32  16  8  4  2  1
[  ] [  ] [  ] [  ] [ ] [ ] [ ] [ ]

👉 These numbers are powers of 2

🎓 5. Example: Convert 192

We need to make 192 using these numbers

Step-by-step:

192 - 128 = 64 → use 128 → put 1
64 - 64 = 0   → use 64  → put 1

Remaining = 0 → rest are 0

Final boxes:

128  64  32  16  8  4  2  1
 1    1   0   0   0  0  0  0

Final answer:

192 = 11000000

🎓 6. Example: Convert 168

Step-by-step:

168 - 128 = 40 → 1
40 - 32 = 8   → 1
8 - 8 = 0     → 1

Boxes:

128  64  32  16  8  4  2  1
 1    0   1   0   1  0  0  0

Final:

168 = 10101000

🎓 7. Example: Convert 1

00000001

🎓 8. Example: Convert 0

00000000

🎓 9. Full IP in Binary

192.168.1.10 =
11000000.10101000.00000001.00001010

🎓 10. VERY SIMPLE MEMORY TRICK

👉 Think:

Big numbers → left side
Small numbers → right side

🎓 11. Shortcut Table (Memorize This)

👉 These are used in subnet masks

🎓 12. Why This Matters

You need this to understand:

• subnet mask
• network vs host
• AWS VPC
• CIDR

🎓 FINAL SUMMARY

👉 bit = 0 or 1
👉 8 bits = 1 byte = 1 octet
👉 octet = 0–255
👉 IP = 4 octets = 32 bits
👉 boxes = powers of 2
👉 fill with 1s to reach number