IPv6 address format

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. How many bits are in an IPv6 address?

A 32 bits

B 128 bits

2. How many groups does a full IPv6 address have?

A Eight groups

B Four groups

3. Which character separates the groups in an IPv6 address?

A A colon :

B A full stop .

4. How many hexadecimal digits are in each group of a full IPv6 address?

A Two hex digits

B Four hex digits

5. Which one is written in the correct IPv6 format?

A 2001:0DB8:0000:0000:0000:FF00:0042:8329

B 2001.0DB8.0000.0000.0000.FF00.0042.8329

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
12001:0DB8:0000:0000:0000:FF00:0042:8329		A2001:0DB8:ABCD:0012:0000:0000:00FF:1A2B
22001:0DB8:0000:0000:0000:FF00:0042:8329 = 128 bits		BFull stops are used as separators. IPv6 groups must be separated by colons.
3IPv6 groups are separated by colons, not full stops like IPv4		CFE80:0000:0000:0000:0202:B3FF:FE1E:8329
4Each IPv6 group has exactly four hex digits (0-9 and A-F)		DOnly seven groups are shown. A full IPv6 address needs eight groups.
52001:0DB8:0000:0000:FF00:0042:8329		EA full IPv6 address: eight groups of four hex digits separated by colons
62001.0DB8.0000.0000.0000.FF00.0042.8329		FEight groups x 16 bits per group (4 hex digits x 4 bits) gives 128 bits in total

Definitions

IPv6 address

Fill in the Blanks

Complete each line of code by filling in the missing parts.

An IPv6 address is ___ bits long.

An IPv6 address has _ groups of hex digits.

Each IPv6 group has _ hex digits.

IPv6 groups are separated by a _____.

8 groups x 4 digits x _ bits = 128 bits

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A groups = 8

B digits = 4

C bits = groups * digits * 8

Question 2

A g1 = '2001'

B g2 = '0DB8'

C g3 = '00GF'

Question 3

A # first four groups

B part = '2001-0DB8-0000-0042'

C print(part.split(':'))

Question 4

A version = 6

B groups = 8

C digits = 4

D print('IPv6 is 32 bits')

Question 5

A groups = 4

B digits = 4

C print(groups, 'x', digits)

Answer Key

IPv6 address format

Section A: Quick Questions

B — 128 bits

A — Eight groups

A — A colon :

B — Four hex digits

A — 2001:0DB8:0000:0000:0000:FF00:0042:8329

Section B: Match the Pairs

2001:0DB8:0000:0000:0000:FF00:0042:8329 → A full IPv6 address: eight groups of four hex digits separated by colons

2001:0DB8:0000:0000:0000:FF00:0042:8329 = 128 bits → Eight groups x 16 bits per group (4 hex digits x 4 bits) gives 128 bits in total

IPv6 groups are separated by colons, not full stops like IPv4 → FE80:0000:0000:0000:0202:B3FF:FE1E:8329

Each IPv6 group has exactly four hex digits (0-9 and A-F) → 2001:0DB8:ABCD:0012:0000:0000:00FF:1A2B

2001:0DB8:0000:0000:FF00:0042:8329 → Only seven groups are shown. A full IPv6 address needs eight groups.

2001.0DB8.0000.0000.0000.FF00.0042.8329 → Full stops are used as separators. IPv6 groups must be separated by colons.

Section C: Definitions

IPv6 address — A 128-bit address written as eight groups of four hex digits separated by colons, e.g. 2001:0DB8:0000:0000:0000:FF00:0042:8329

Section D: Fill in the Blanks

An IPv6 address is 128 bits long.

An IPv6 address has 8 groups of hex digits.

Each IPv6 group has 4 hex digits.

IPv6 groups are separated by a colon.

8 groups x 4 digits x 4 bits = 128 bits

Section E: Spot the Error

C — Each hex digit stands for 4 bits, so the total is 8 groups x 4 digits x 4 bits = 128 bits. The line should multiply by 4, not 8.

C — Hexadecimal digits only go from 0 to 9 and A to F. G is not a valid hex digit, so the group should be '00FF'.

B — The groups in an IPv6 address are separated by colons, not hyphens. The line should be part = '2001:0DB8:0000:0042'.

D — An IPv6 address is 128 bits long. 32 bits is the size of an IPv4 address. The line should print 'IPv6 is 128 bits'.

A — An IPv6 address has eight groups, not four. The line should be groups = 8.