Mr.DNS Free Online Network Tools

DNS Lookups Section

The DNS lookups section lets you perform various DNS lookups
against IP addresses and hostnames.

Mr.DNS supports the most commonly used DNS lookups, including:

SOA	Start of Authority for a domain/hostname
NS	Name Server for a domain/hostname
MX	Mail Exchangers for a domain/hostname
A	A Record for a domain/hostname (IPv4)
AAAA	AAAA Record for a domain/hostname (IPv6)
CNAME	Canonical Name for a hostname
PTR	Pointer Record for an IP address
TXT	Text Record
SPF	Sender Policy Framework Record
SRV	Service Locator Record
LOC	Method for adding location informaton to DNS

Simply enter a hostname or IP address, and select the type of
lookup you'd like to do.

DNSSEC Lookups Section

The DNSSEC lookups section lets you perform various DNS lookups
for DNSSEC specific resource records

DNSKEY	Holds public keys used for DNSSEC authentication.
RRSIG	An RRSIG record contains the signature for an RRset with a particular name, class, and type.
NSEC	the next owner name (in the canonical ordering of the zone) that contains authoritative data or a delegation point NS RRset, and the set of RR types present at the NSEC RR's owner name.
DS	A DS RR refers to a DNSKEY RR by storing the key tag, algorithm number, and a digest of the DNSKEY RR.
NSEC3	The NSEC3 Resource Record (RR) provides authenticated denial of existence for DNS Resource Record Sets.
NSEC3PARAM	The NSEC3PARAM RR contains the NSEC3 parameters (hash algorithm, flags, iterations, and salt) needed by authoritative servers to calculate hashed owner names.

Simply enter a hostname or IP address, and select the type of
lookup you'd like to do.

HTTP Headers Check

This tool does an HTTP HEAD request on the given URL and provides
a sorted list of all the HTTP response headers.

The URL can be http or https, and can include a full URL to a file,
which can be handy when diagnosing issues related to caching or
compression on specific files.

IANA Whois Lookup

This tool performs a standard whois lookup against the various
Regional Internet Registries (RIR).

ARIN - American Registry for Internet Numbers
AfriNIC - African Network Information Centre
APNIC - Asia-Pacific Network Information Centre
LACNIC - Latin American and Caribbean Internet Addresses Registry
RIPE NCC - Réseaux IP Européens Network Coordination Centre

You can lookup IP address allocations, autonomous system numbers (AS's)
and any other registry specific information.

Ping

This tool sends standard ICMP ECHO_REQUEST packets to the given
IP address or hostname, and returns the response time and packet
loss statistics.

Multi-RBL Lookup

This tool checks to see if the provided mail server is listed
in ~50 different real-time black hole lists.

You can provide the hostname or IP address or your mail server.

SMTP Server Check

This tool performs a SMTP server check against the given IP
address or hostname.

This check will do several in-depth checks, including various
RFC compliancy checks and tests to see if the server is an
open relay.

The full request/response summary is provided, with response
times and simple validation indicators.

SPF Validation

The SPF Validation section performs a SPF validation against
the provided domain/hostname

We check for a valid entry in both the SPF and TXT resource
record. The entry is parsed and validated, and simple report
is provided.

Multi-URIBL Lookup

This tool checks to see if the provided URL is listed in ~10
different real-tiem URL blocking lists.

You can provide the hostname or domain name of a URL to check
the lists.

Visual Traceroute

This tool performs a standard UDP packet traceroute to the given
IP address or hostname, and returns the IP address, geo-location,
response time and the autonomous system number.

The geo-location of each hop is mapped out on a google map, to give
you a sense of the terrestrial route the data packets took.

The exact path may vary, as the geo-ip lookup is never 100% accurate
and the path is never a 'direct path'- but it still looks cool!

Website Neighborhood Lookup

This tool builds a list of websites that are hosted on the same
IP address as the IP address or hostname provided.

Many shared web hosting companies host hundreds or thousands of
websites on the same IP address. There is absolutely nothing wrong
with this, but sometimes it's good to know who else is being hosted
on the same system as you.

This list will not be 100% complete, but should give you a good
idea of the other sites hosted on the same system as your site.

Whois Lookup

This tool does a standard whois lookup for the given domain,
and should support any TLD (top level domain).