First off a "hacker" is someone who plays with technology for enjoyment but the term has become synonymous with "cracker," a person that performs an illegal act. So ya ask should ya be are worried about crackers? Well I'd say if you use Windows you have a greater chance of being a target. To find out how secure or unsecure you are, perform an internet connection security analysis (of commonly probed ports).

Find your IP and Location

Domain Lookup Enter a domain (for example COM or CH which is short Switzerland), and you can get the name of the country for which that domain is associated.
eMail Dossier
Validate and investigate eMail addresses (for example [email protected]).
Finger
If you can pull a Finger, (for example [email protected]) this will tell you various information about that account.
IP Location
Target the IP host in Latitude/Longitude (for example Microsoft.com, will return Lat, Lon: 47.675, -122.117).
MAC Address
MAC address Short for Media Access Control address, a hardware address that uniquely identifies each node of a network (for example "apple" or "allied" or "00:A0:40" or " 00:80:C7").
Port Scanner
An utility for port scanning networks (for example APPLE.COM).
Reverse DNS
Type in an IP address (for example 17.254.3.183) to find out the DNS or the Domain Name Server.
Traceroute
Traceroute tracks the path taken by packets as they travel from source (the default is the San Diego Super Computer Center) to destination (for example APPLE.COM).
Traffic Rank
The traffic rank (for example APPLE.COM) is based on aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users (reach.)
DNS Health
Offers complete DNS health checkup for your domain. Enter your domain URL and instantly generate a complete report for your domain. The DNS report includes checking which DNS parameters needs attention and also tells those who follow DNS standards. It also checks which blacklist services have your A record and MX record IPs in them. Altogether it includes DNS health test, MX record test, Mail (MX) and blacklist test, domain IP blacklist test, DMARC test, SMTP test for Mail records, and SPF records test.
Whois
Whois, can determine whether the domain name you desire is already in use (for example APPLE.COM); in addition you can learn who administers a particular site; and you can view a list of a site's name servers.
IP Whois
Detailed IP and Network Address Locator Tool (for example 17.254.3.183 will return APPLE.COM).

 

These tools and more, can be found on: DNS Checker, Dynu DNS, SubnetOnline.com,