Category spotlight

DNS & Email Tools

MX, SPF, DMARC, blacklist, and network diagnostics

MX, SPF, DMARC, blacklist, and network diagnostics. These online dns & email tools run entirely in your browser and help you work with dns & email data quickly and safely. Paste or upload your content, configure the options, and get instant results without installing extra software.

Tool catalog

Everything under DNS & Email Tools

Click into any card to open its dedicated `/ dns /slug` route. Live tools render instantly, while planned ones display detailed placeholders so you can track progress.

IP Address Lookup

Locate IP ownership, ASN, and geodata

ip lookup, geolocation

Blacklist Check

Check IPs or hosts against the major DNSBL/RBL providers

blacklist, dnsbl

MX Lookup

List MX records for a domain with live diagnostics

mx lookup, mail exchange

WHOIS Lookup

Query domain registration and registrar data

whois, domain info

DNS Lookup

Inspect DNS records (A, AAAA, MX, TXT, NS, SOA) for any host

dns lookup, dns records

DNS Record Lookup

Inspect DNS records (A, AAAA, CNAME, MX, TXT, NS, SOA) for any host

dns records, all records

SMTP Diagnostics

Open-port SMTP handshake test with banner and TLS validation

smtp test, port 25

SSL Certificate Checker

Validate certificate chains, expiry, and hostname coverage

Email Health Check

Bundle MX, SPF, DKIM, DMARC, and blacklist posture

email health, deliverability

Ping Test

ICMP ping with geo-distributed vantage points

DNS Health Monitor

Run a multi-record health check for misconfigurations

DNS Propagation Check

Check record propagation across global resolvers

dns propagation, global dns

DMARC Record Checker

Validate DMARC policies and reporting endpoints

dmarc, email security

SPF Record Checker

Fetch and lint SPF TXT records with flattening guidance

spf, txt record

Traceroute Tool

Network hop trace with timing and packet loss stats

traceroute, trace

A Record Lookup

Resolve IPv4 A records with TTL insights

DKIM Record Lookup

Resolve DKIM selectors and verify public keys

TCP Port Check

Test TCP connectivity and banner responses

PTR Record Lookup

Check reverse DNS and map IPs back to hostnames

ptr, reverse dns

TXT Record Lookup

Retrieve TXT records (SPF, DKIM, ownership proofs) for a host

CNAME Lookup

Follow canonical name chains for any hostname

HTTP Availability Check

Verify HTTP responses, status codes, and headers

HTTPS Availability Check

Ensure TLS endpoints respond with valid certificates

NS Record Lookup

List authoritative name servers for a domain

ns, name server

TLS Test

Scan TLS versions, cipher suites, and MTA-STS support

AAAA Record Lookup

Resolve IPv6 AAAA records with reachability hints

DNS Change Monitor

Track record changes and alert when DNS drifts

dns monitor, change detection

SOA Record Lookup

Inspect Start of Authority metadata for a zone

MTA-STS Checker

Validate SMTP MTA-STS policies and TLSRPT endpoints

ARIN Lookup

Fetch ownership data for IPv4/IPv6 ranges

BIMI Checker

Confirm BIMI records, SVG logos, and HTTPS hosting

DNS & Email Tools | Utilz.io