Top 5 thing to know about trace IP address:
There are several ways to trace IP address and hacker can be trace an IP address easily by some means. Here are the main sources by adopting these you can easily trace IP addresses of anybody or someone can trace yours IP address.
Most Internet/email providers today no longer include the email address of someone sending an email. People can find IP address through an Email html bug. This bug is not a virus but it’s just a piece of code and when you read the email the bug tells to the sender that you read the Email and show your IP address to the sender. The email header on your office's email could reveal your IP address, and a clever IT-minded person can easily use it to find the location of your work place.
By borrowing computer or devices:
If you use or any other person borrow your computer or devices, it’s easy for you and also them to trace the IP address. You can just type what is my IP address and trace that IP address. If you're home network isn't well secure, a stranger can tap into your wireless network. Also, if you let a guest use your network (you provide the password) they will know your IP address.
From web server logo:
Every time you visit a website, you leave your IP address. After all, it's your digital pass to connect online. A website can (if they wish) scour their Web-server computers to review all the IP addresses, just to see the reach of their message or who's a repeat visitor.
Through social Media:
Social media sites (Facebook, Twitter, Instagram, Snapchat, etc.) do not reveal IP addresses between users, but the site administrators indeed know your IP address. Also, if you click on an ad or link on the site, the they will capture your IP address.
Through messaging app:
Your mobile phone uses an IP address every time you engage someone through a messaging app, such as WhatsApp and Viber. Messaging app usage is growing incredibly fast. Your IP address is invisible to the person you message, but if-and-when you click on a link in a message, the website you sent it to has access to your IP address.
So all these sources or methods are tracing your IP addresses easily to someone else and the other persons IP address to you.