Изменить: IPv4 vs. IPv6: What Is the Difference?

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<p class="content-article__lead">IPv4 and IPv6 are versions of the Internet Protocol. IPv6 offers far more addresses, while IPv4 remains important for compatibility.</p>
<div class="content-article__meta"><div><span class="content-article__meta-label">Published</span><span>August 23, 2026</span></div><div><span class="content-article__meta-label">Reading time</span><span>5 min read</span></div></div>
<h2>Format and capacity</h2>
<p>IPv4 uses 32-bit addresses and four decimal groups, such as 203.0.113.10. It has about 4.3 billion possible addresses.</p>
<p>IPv6 uses 128-bit addresses written in hexadecimal, such as 2001:db8:85a3::8a2e:370:7334. Its address space is vastly larger.</p>
<h2>Why IPv6 was introduced</h2>
<p>IPv4 could not provide a unique public address for every modern device. NAT delayed the shortage by allowing many devices to share one public address, but it adds complexity.</p>
<p>IPv6 gives networks far more globally unique addresses. Both versions still require correctly configured firewalls.</p>
<h2>Speed and compatibility</h2>
<p>IPv6 does not automatically make a connection faster. Speed and latency depend mainly on the provider, local network, route, and destination service.</p>
<p>Most modern networks use dual stack, supporting IPv4 and IPv6 at the same time. Leaving both enabled is usually the most compatible option.</p>
<h2>Frequently asked questions</h2>
<div class="content-faq"><div class="content-faq__item"><h3>Is IPv6 safer than IPv4?</h3><p>Neither is automatically safer. Both need updated devices, secure services, and correct firewall rules.</p></div><div class="content-faq__item"><h3>Why do I still see an IPv4 address?</h3><p>IPv4 remains widespread for compatibility, and a tool may show the version used for a particular connection.</p></div></div>

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