IP e rede

DNS reverso (PTR)

Descubra o hostname pelo endereço IP via registro PTR.

Fatos principais

Check a PTR (rDNS) record online: enter an IP and see the hostname tied to it and whether it matches in the forward direction. Free, no sign-up. A PTR record is usually set by the owner of the IP block, the hosting provider, not by the domain owner.

Preço: Grátis
Cadastro: Não é necessário
Processamento: On our server: the PTR query goes through the server's DNS resolver (gethostbyaddr), then we check whether the name found points back to this IP
Entrada: An IP address (IPv4 or IPv6) or a hostname; a name is first resolved to an IP
Limites: 30 checks per minute per IP; no sign-up; one address at a time; the forward check compares only a single IPv4 address of the name
Resultado: The hostname from the PTR record, the list of PTR records found and a flag showing whether the name's forward record matches the original IP
Última atualização: 2026-11-02

Consulta de DNS reverso (PTR)

Determine o nome de domínio a partir do endereço IP pelo registro PTR. O DNS reverso é usado na autenticação de servidores de e-mail, em diagnósticos e na segurança.

Registro PTR por endereço IP

Verificação de correspondência entre DNS direto e reverso

Suporte a IPv4

Como usar

Digite um endereço IP para a consulta de DNS reverso
Clique no botão de consulta de registro PTR
Revise o nome de domínio associado a este endereço IP

FAQ

A PTR record belongs to an IP address, not to a domain. Enter the domain's hostname: we first resolve it to an IP, then show the PTR record of that address and whether it matches the original IP.

Enter an IP address (or a hostname) and click Check. The tool requests the reverse record, shows the hostname and flags whether that name points forward to the same IP. No sign-up; the limit is 30 checks per minute.

A PTR maps an IP address to a hostname, so it works in the opposite direction from an A record. It matters for mail servers: many receivers check the sender's PTR when accepting mail and mark the message suspicious if it is missing.

Whoever controls the block of IP addresses: the hosting provider or ISP. PTR cannot be edited in the DNS panel of your domain; it is usually changed in the hosting panel or by a support request.

We take the name from the PTR and resolve it back to an IP. If the result differs from the original address, the pair is not confirmed. The check is simplified: it uses a single IPv4 address, so names with several A records may give false mismatches.

None is configured for that IP. Common cases are home-ISP addresses, new VPS instances and IPs without a purchased service. Ask the owner of the IP block (the host or provider) to create the record.

The hostname of an IPv6 address is determined, but a separate list of PTR records is requested only for IPv4. For a deep IPv6 analysis use command-line utilities such as dig -x.

PromoPilot vs. alternativas: comparação

Comparamos apenas o que está confirmado nas páginas de cada serviço. Onde não conseguimos confirmar um dado, a célula mostra "—".

Parâmetro	PromoPilot	MXToolbox Reverse Lookup	Google Admin Toolbox: Dig
Free and sign-up	Yes: 30 checks per minute, no sign-up	Price not stated; the page says nothing about sign-up	—
PTR lookup by IP	✓	✓	—
Forward-confirmed check (FCrDNS)	✓ simplified (one IPv4 address)	—	—
IPv6	Partly: the hostname is shown, the PTR list is IPv4 only	—	—
Notes	Hints on who configures PTR	Notes that PTR records generally must be configured by your ISP	A domain name is entered; PTR support is not described on the page

Role a tabela para os lados

Onde somos mais fracos: the check goes through one DNS resolver, the forward record is verified in a simplified way, there is no bulk check or history; many details of analogues could not be confirmed on their official pages.

Quando escolher o PromoPilot: When you need a quick check whether a mail server or host IP has a PTR record and whether it matches the forward one. For checks from several DNS servers and a deeper look at IPv6, use utilities such as dig.

Verificado em: 2026-10-16. "—" significa que não foi confirmado na página oficial; condições e preços mudam, então confira os sites dos próprios serviços.