IT Glossary
What is an IP address?
The unique identifying number of a device on a network — the digital equivalent of a postal address.
Every phone, laptop and server connected to the internet is handed a string of numbers such as 86.120.44.7. That is its IP address, and without it data would have nowhere to be delivered, exactly as a parcel with no address goes nowhere. In the working life of a company, IP addresses turn up in very concrete places. The server hosting your website has a public one. Your accountants reach the Romanian tax authority's online portal from the office address. Access to internal applications can be restricted to the office IP as a cheap and surprisingly effective security control. The distinction worth understanding is between a dynamic address, which changes periodically and comes as standard on ordinary connections, and a static one, which stays constant and is needed when you host something yourself or want stable access rules. Knowing which addresses your company uses is not trivia: it comes up in every security conversation, every firewall rule and every discussion about connecting two systems together.
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Why it matters for your business
Access control by address
Sensitive internal applications can be reachable only from the office network or through a VPN — a cheap, effective barrier against unauthorised access.
Faster diagnosis of connection faults
When the network is down or a customer cannot reach your site, checking which addresses are involved is the first step of any serious diagnosis.
Email deliverability protected
Your mail leaves from an address with a reputation attached. If that reputation is damaged, your invoices land in spam — an argument for using managed email services.
Frequently asked questions
What is the difference between a public and a private IP address?
The public one is what the internet sees, normally the address of your office router. Private addresses such as 192.168.x.x exist only inside your internal network and are reused in millions of offices worldwide without any conflict.
Does my company need a static IP address?
Only if you host something on site — a server, cameras reachable from outside — or want access rules pinned to a fixed address. For browsing, email and cloud applications, the standard dynamic address your provider gives you is entirely sufficient.
Can someone locate me from my IP address?
Approximately. An address usually reveals the city and the internet provider rather than a street. Combined with other data it can identify a specific company, which is why IP addresses count as personal data under the GDPR and belong in your privacy documentation.
Let’s talk about your project
Message us on WhatsApp or send an email — you talk directly to a developer.
office@northdan.com · +40 752 070 247