Čo je Reverzné DNS?

How Reverse DNS Works

Reverse DNS uses PTR (Pointer) records to map an IP address back to its associated hostname. When an application, mail server, or network service performs a Reverse DNS lookup, it queries the appropriate reverse DNS zone to retrieve the hostname linked to that IP address.

A typical Reverse DNS lookup follows these steps:

1. A service receives a request or connection from an IP address.
2. A Reverse DNS lookup is performed for that IP address.
3. The authoritative DNS server returns the corresponding PTR record.
4. The returned hostname is used to verify the server's identity, support email authentication, or assist with logging and network troubleshooting.

Properly configured Reverse DNS helps establish trust between systems and is commonly used by mail servers, hosting providers, and network administrators to validate connections.

Prečo potrebujete externú službu reverzného DNS?

Managing Reverse DNS infrastructure requires authoritative DNS servers, ongoing maintenance, and protection against DNS attacks. By outsourcing Reverse DNS hosting to ClouDNS, network operators can reduce operational overhead while benefiting from our globally distributed Anycast DNS network, high availability, and DDoS-protected infrastructure.

The service is very useful for those administrators who manage their own mail servers. Reverse DNS must exist for the IP address from which the outgoing e-mail is sent. The reason is that many mail servers on the Internet are configured to reject incoming mail from any IP address that does not have Reverse DNS (rDNS).

*Standards from the IETF (Internet Engineering Task Force) suggest that every domain should be capable of Reverse DNS lookup. Prečítajte si viac

Reverzné DNS hosting poskytované ClouDNS je postavený na sieti Anycast DNS, ktorá poskytuje maximálnu možnú rýchlosť a bezpečnosť z ľubovoľného miesta na svete.

Benefits of using Reverse DNS

Reverse DNS provides valuable information about IP addresses, which can be extremely beneficial for a variety of reasons. Moreover, if Reverse DNS is configured properly, it can massively enhance the overall performance and security of a network.:

How to configure Reverse DNS in ClouDNS?

Setting up Reverse DNS in ClouDNS is simple and essential for ensuring your network runs smoothly. To do that follow these steps:

1. Login to your ClouDNS account
2. Navigate to DNS zones and select Create zone
3. Choose either the Master reverse zone or Secondary reverse zone option
4. In the Generate zone by subnet field enter the reverse zone name (IP address)
5. If configuring a Master reverse zone Add PTR record(s) for your domain(s) and Request IP delegation to ClouDNS servers from the IP owner
6. If configuring a Slave reverse zone Enter the Master server IP and Click Register

Reverzný DNS IPv4

ClouDNS poskytuje primárne aj sekundárne DNS pre reverzné DNS zóny IPv4. Podporované rozsahy sietí sú::

IPv4 Reverse DNS ensures each IP address has a corresponding PTR (Pointer) record. This mapping is crucial for services like email servers that require PTR records for domain validation and aids in network diagnostics by enabling traceable IP address logs.

Reverzný DNS IPv6

ClouDNS provides both Primary and Secondary DNS for IPv6 Reverse DNS zones. The supported network ranges are from /32 to /128. With IPv6 Reverse DNS, IPv6 addresses are mapped to domain names using PTR records in the ip6.arpa domain. This is vital for managing the vast IPv6 address space efficiently and troubleshooting, ensuring each address can be resolved to its domain for security and operational needs.

DNS zóny

Každý rozsah siete (zoznam blokovaných IP) vyžaduje konfiguráciu jednej zóny DNS. Napríklad, ak máte / 22 IPv4 rozsah siete, musíte ho rozdeliť do 4 zón DNS pre každú / 24 podsieť. Počet záznamov PTR, ktoré je možné konfigurovať do zóny DNS, nie je nijako obmedzený.

DNS zones are vital for organizing PTR records for both IPv4 and IPv6 addresses. Structuring IP ranges into DNS zones allows for more efficient management of IP address resolution, ensuring quick DNS propagation and reliable domain name resolution.

Okamžitá propagácia DNS

Naše Spravovaná služba DNS funguje v rámci vlastného systému s okamžitou propagáciou DNS vo všetkých dátových centrách zahrnutých v našej sieti. Webový ovládací panel umožňuje našim zákazníkom sledovať šírenie údajov vo všetkých dátových centrách v reálnom čase. Akýkoľvek z vašich názvov domén môžete kedykoľvek skontrolovať, aký je stav aktualizácie pre každé dátové centrum. V kombinácii s nízkymi hodnotami TTL (už za 1 minútu) môžu naši zákazníci nasadiť akékoľvek zmeny rýchlejšie bez akýchkoľvek prestojov.

Potrebujete pomoc?

• Ako vytvoriť hlavnú alebo podradenú reverznú zónu DNS
• Čo je PTR záznam?
• Mať otázku? Opýtajte sa nás na support@cloudns.net

Why Choose ClouDNS Reverse DNS?

Managing Reverse DNS shouldn't require maintaining your own authoritative DNS infrastructure. ClouDNS provides a reliable, globally distributed Reverse DNS service designed for network operators, hosting providers, and businesses managing IPv4 and IPv6 address space.

With ClouDNS, you benefit from:

• Global Anycast DNS network for fast and reliable resolution
• Support for both Primary and Secondary Reverse DNS zones
• IPv4 and IPv6 Reverse DNS hosting
• Instant DNS propagation across our network
• API for automated DNS management
• Reliable infrastructure with DDoS protection
• Unlimited PTR records per DNS zone

Potrebujete vlastnú ponuku?

If you need a custom quote, additional zones or set up of a branded DNS service, please click the button and fill the form!