What Is DNS?
DNS stands for Domain Name System — and it is one of the most important yet invisible parts of the internet. Every time you type a web address like google.com into your browser, DNS translates that human-readable name into the numerical IP address the network actually uses to route your request. Without DNS, you would need to remember addresses like 142.250.185.46 instead of google.com.
DNS affects every website visit, every app request, and every email sent. It also has significant implications for your browsing speed and privacy — especially regarding what your ISP can see. Understanding DNS is foundational to understanding how your ISP interacts with your traffic.
How DNS Resolution Works: Step by Step
When you visit a website, a chain of queries happens in milliseconds:
- 1. Stub resolver — Your device checks its local DNS cache. If the answer is stored, it uses it immediately (no network query needed).
- 2. Recursive resolver — If not cached, your device asks a recursive resolver — usually operated by your ISP (e& or Du) or a public DNS provider like Cloudflare (1.1.1.1).
- 3. Root nameserver — The recursive resolver asks one of 13 root nameserver clusters: "Who handles .com domains?"
- 4. TLD nameserver — The root server directs the resolver to the .com TLD nameserver, which knows which authoritative server manages
google.com. - 5. Authoritative nameserver — The resolver queries Google's authoritative DNS server, which returns the actual IP address.
- 6. Response — The resolver returns the IP to your device and caches it for future queries based on the TTL value.
This entire process typically completes in 20–100 ms. Cached responses are near-instant. Choosing a fast DNS resolver — covered in our best DNS servers guide — reduces the lookup time for uncached domains.
DNS Record Types
| Record Type | Purpose | Example Value |
|---|---|---|
| A | Maps domain to IPv4 address | 93.184.216.34 |
| AAAA | Maps domain to IPv6 address | 2606:2800:220:1:248:1893:25c8:1946 |
| CNAME | Alias from one domain to another | www → example.com |
| MX | Mail server for the domain | mail.example.com (priority 10) |
| TXT | Arbitrary text (SPF, DKIM, verification) | v=spf1 include:_spf.google.com ~all |
| NS | Authoritative nameservers for domain | ns1.example.com |
| PTR | Reverse lookup (IP → domain) | mail.example.com |
| SOA | Start of Authority — zone metadata | Primary NS + admin email + serial |
TTL and Caching
Every DNS record includes a TTL (Time to Live) value — the number of seconds resolvers should cache the record before re-querying. A record with TTL 3600 is cached for one hour. During that hour, lookups for that domain are served from cache without hitting any nameserver.
- Low TTL (60–300 s) — Changes propagate quickly; useful during server migrations. Higher query load on authoritative servers.
- High TTL (3600–86400 s) — Faster responses from cache; reduced server load. Slower propagation of DNS changes.
DNS over HTTPS and DNS over TLS
Traditional DNS queries are sent in plain text — anyone on the network path (your ISP, public Wi-Fi operator, or government infrastructure) can see every domain you look up. Two modern standards encrypt DNS traffic:
- DNS over HTTPS (DoH) — Wraps DNS in HTTPS on port 443, making it indistinguishable from regular web traffic. Supported natively in Chrome, Firefox, Edge, iOS 14+, and Windows 11.
- DNS over TLS (DoT) — Uses a dedicated TLS connection on port 853. Available as "Private DNS" in Android 9+. Easier to block than DoH but cleaner architecturally.
Enabling DoH or DoT prevents your ISP from monitoring your DNS queries. However, your DNS provider (Cloudflare, Google, etc.) can still see them — choose a provider with a strict no-logs policy.
DNS and Your Privacy in the UAE
By default, UAE broadband customers use e&'s or Du's DNS resolvers. These resolvers enforce content filtering as required by UAE regulations and can log all domain queries. Switching to an encrypted third-party resolver like Cloudflare's 1.1.1.1 with DoH prevents the resolver-level view of your browsing — though traffic content is still routed through your ISP.
For guidance on switching, see our step-by-step guides for iPhone, Android, Windows 11, and macOS. For server recommendations, see our best DNS servers guide.
How DNS Affects Browsing Speed
DNS lookup time is added to every new domain connection. On a page that loads resources from ten different domains, ten DNS lookups happen in sequence or parallel. Faster DNS reduces this overhead. Key factors:
- Resolver speed — Cloudflare 1.1.1.1 averages ~14 ms globally; ISP resolvers vary widely
- Cache hit rate — Popular domains are almost always cached; obscure domains require full resolution
- Resolver location — A resolver with nearby nodes (Cloudflare and Google both have UAE PoPs) responds faster than one routing queries across continents
If your internet feels sluggish despite a fast connection on our speed test, slow DNS could be a contributing factor. Switching to a faster resolver is one of the quickest free improvements you can make.