The nslookup command
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which command asks a DNS server for the IP address of example.com?
2. What does nslookup example.com do?
3. In the nslookup reply, where do you find the website's IP address?
4. The first Server and Address lines in an nslookup reply show:
5. You run nslookup example.com. Which part of the reply is the answer to your lookup?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1nslookup example.com | Anslookup example.com | |
| 2Address: 93.184.216.34 | BThe Server line shows the DNS server that answered, not the website. The website's IP is on the Address line after the Name line. | |
| 3Look up the IP address for a website called example.com using a DNS server | CThe line in the nslookup reply that shows the IP address of the website you asked about | |
| 4The reply starts with the DNS server that answered, showing its name and its own address | DAsks a DNS server for the IP address that matches the domain name example.com | |
| 5nslookup 93.184.216.34 | EThis gives an IP address, but the command should be given a domain name like example.com so the DNS server can find the matching IP address. | |
| 6Server: 93.184.216.34 (this is the address of example.com) | FServer: dns.google |
C
Definitions
nslookup example.com
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
________ example.com
2.
nslookup ___________
3.
Name: example.com
_______: 93.184.216.34
4.
______: dns.google
Address: 8.8.8.8
5.
> ________ wikipedia.org
Name: wikipedia.org
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
> nslookup example.com
B
Server: dns.google
C
Address: 8.8.8.256
D
Name: example.com
E
Address: 93.184.216.34
Question 2
A
> nslookup bbc.co.uk
B
Server: 192.168.1.1
C
Name: bbc.com
D
Address: 151.101.0.81
Question 3
A
> nslookup https://example.com
B
Server: dns.google
C
Address: 8.8.8.8
D
Name: example.com
E
Address: 93.184.216.34
Question 4
A
> nslookup abc.net.au
B
Server: abc.net.au
C
Address: 8.8.8.8
D
Name: abc.net.au
E
Address: 13.224.1.10
Question 5
A
> ping google.com
B
Server: dns.google
C
Address: 8.8.8.8
D
Name: google.com
E
Address: 142.250.70.14
Answer Key
The nslookup command
Section A: Quick Questions
Q1
A — nslookup example.com
Q2
A — Asks a DNS server for the IP address that matches the domain name
Q3
B — On the Address line listed under the domain Name
Q4
B — Which DNS server answered your question
Q5
A — The Address line below Name: example.com
Section B: Match the Pairs
Q1
nslookup example.com → Asks a DNS server for the IP address that matches the domain name example.com
Q2
Address: 93.184.216.34 → The line in the nslookup reply that shows the IP address of the website you asked about
Q3
Look up the IP address for a website called example.com using a DNS server → nslookup example.com
Q4
The reply starts with the DNS server that answered, showing its name and its own address → Server: dns.google
Q5
nslookup 93.184.216.34 → This gives an IP address, but the command should be given a domain name like example.com so the DNS server can find the matching IP address.
Q6
Server: 93.184.216.34 (this is the address of example.com) → The Server line shows the DNS server that answered, not the website. The website's IP is on the Address line after the Name line.
Section C: Definitions
Q1
nslookup example.com — A command that asks a DNS server for the IP address that matches a domain name. The reply shows which DNS server answered and the Address line with the site's IP.Section D: Fill in the Blanks
Q1
nslookup example.comQ2
nslookup example.comQ3
Name: example.com
Address: 93.184.216.34Q4
Server: dns.google
Address: 8.8.8.8Q5
> nslookup wikipedia.org
Name: wikipedia.orgSection E: Spot the Error
Q1
C — The Address line under Server is the DNS server's IPv4 address. An IPv4 number can't be above 255, so 8.8.8.256 is invalid. It should be 8.8.8.8.
Q2
C — The Name line repeats the domain that was looked up. We asked about bbc.co.uk, so the reply should say bbc.co.uk, not bbc.com.
Q3
A — nslookup needs only the domain name, not a full URL. Remove the https:// and type: nslookup example.com.
Q4
B — The Server line shows which DNS server answered, not the site we looked up. It should show the DNS server's name, such as dns.google.
Q5
A — ping checks whether a device replies. It doesn't ask a DNS server for an address. The command should be nslookup google.com.