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Subnet CalculatorCIDR Range ViewerVLSM CalculatorVLAN PlannerBandwidth CalcIPv6 Subnet CalcIP ↔ BinarySupernet CalcCIDR MergeCIDR to IP RangeCIDR SplitIPv4 → IPv6CIDR OverlapFree IP Space FinderDHCP CalculatorMTU Calculator
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Email InspectorDKIM CheckerEmail HeadersSMTP TestSMTP TLS CheckMX Health CheckEmail SecurityDMARC Generator
Temp Mail很快
Is It Down?SSL/TLS CheckerOpen Port CheckerOG Tag CheckerOCSP CheckerPing / LatencyHTTP InspectorRedirect ChainCSP AnalyzerTech Stack CheckerBetaTracerouteBetaHTTP/2 + HTTP/3robots.txt ViewerSSL Cert DecoderBanner GrabberWebSocket TesterCORS TesterDomain MonitoringHTTP TimingStructured DataPWA ManifestSEO Auditor
One-Time SecretHash GeneratorPassword StrengthSecurity.txtCT Log SearchAXFR Zone Test
HTTP Sec Score很快
WebRTC Leak TestIP Reputation
JSON FormatterYAML FormatterBase64 / URL EncodeJWT DecoderRegex TesterUnix TimestampCron BuilderUUID / ULIDPunycode / IDNBase ConverterACL Generator
CSS Unit ConverterColor ToolkitGradient GeneratorcURL BuilderURL ParserURL Encoder/DecoderHTTP Status CodesBox Shadow GenFavicon GeneratorFlex & Gridrobots.txt Tester
Text CompareCase ConverterText CleanerText AnalyzerText TransformerList ToolsLorem GeneratorSlug Generator
Cloud VPC PlannerCloud IP RangeSecurity GroupsIAM AnalyzerK8s CIDR PlannerFirewall BuilderHCL FormatterEgress Cost CalcCloud DNS Zone
VM Cost Estimator很快
Proxmox Net ConfigVMware Port GroupHyper-V vSwitchVXLAN VNI PlannerKVM Net ConfigXCP-ng NetworkNSX-T Segment
Disposable Email DetectorPhone InspectorTor Exit NodeVPN/Proxy DetectDomain ReputationTyposquat DetectUsername SearchFavicon Hash
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2.43.fdd8a93

DMARC生成器

为您的域名创建有效的 DMARC TXT 记录。选择一种策略，添加报告地址，然后将结果复制到您的 DNS 中。

Step 1 - Policy
Step 2 - Aggregate report email(recommended)

Aggregate XML reports are sent daily or weekly by receiving mail servers. Required to see who is sending email on your domain's behalf.

Generated TXT record
v=DMARC1; p=none
Name: _dmarc.yourdomain.comType: TXTTTL: 3600
Add to DNS
_dmarc.yourdomain.com.  3600  IN  TXT  "v=DMARC1; p=none"

相关工具

Email Inspector

输入电子邮件地址以验证其安全性并评估其域安全性，或者单独输入域名以检查 SPF、DMARC、DKIM 和 MX 记录。

SPF Analyzer

解析和分析任何域的 SPF 记录 - 包括递归包含链、DNS 查询计数和策略违规检测。

Email Header Analyzer

粘贴原始电子邮件标头，以跟踪传递路径、检查身份验证结果并逐跳测量时间。

关于此工具

DMARC（基于域的消息认证、报告和一致性）告知接收邮件服务器如何处理未通过 SPF 或 DKIM 检查的邮件。DMARC 记录以 DNS TXT 记录的形式发布在_dmarc.yourdomain.com处。建议先使用p=none收集报告，这样不会影响邮件投递；然后逐步升级到quarantine，最后在确认所有合法邮件都能正常投递后，再升级到reject。

汇总报告（rua=）是由大型邮件服务商发送的压缩 XML 文件。它们显示哪些 IP 地址发送了声称来自您域名的邮件，以及 SPF 和 DKIM 验证是否通过。取证报告（ruf=）针对每封邮件，包含完整的邮件头信息 - 出于隐私考虑，许多服务商会忽略这些报告。