🔁 Reverse DNS (PTR) Lookup: How It Works and Why It Matters

A PTR record, also known as reverse DNS (rDNS), maps an IP address to a domain name. This is important for email servers, spam filters, and general trust of your hosting setup. In this article, you'll learn what rDNS is and how to check a PTR record online.

📌 What is a PTR Record?

• 🔄 PTR (Pointer Record) links an IP address to a domain name
• 📧 Used by email servers to verify the sender's legitimacy
• 🛡 Essential for anti-spam filters — a missing or mismatched PTR can cause mail rejection
• 📈 Affects IP trust score and email deliverability

🧪 How to Check rDNS Online

1. 1️⃣ Visit the Reverse DNS Lookup tool
2. 2️⃣ Enter the desired IPv4 or IPv6 address
3. 3️⃣ Click “Check” to see which domain (if any) is associated with the IP
4. 4️⃣ If the result is empty — PTR is not set or unavailable

⚙️ Where Are PTR Records Set?

PTR records cannot be configured in standard DNS panels. They are set by the IP address provider (usually your hosting company). On Bit.Hosting, you can request PTR configuration via a support ticket.

✅ Why Check rDNS?

• 📨 Ensure proper email delivery — especially when using your own SMTP
• 🚫 Reduce the risk of your messages going to spam
• 🔐 Prove IP legitimacy in corporate and secure networks
• 📊 Diagnose connections and analyze incoming traffic