DNS Record & Propagation Lookup
Query live A, AAAA, MX, TXT, NS, CNAME, and SOA DNS records using Google DNS over HTTPS (DoH).
Diagnosing Domain Name System (DNS) Resolution & Records
DNS maps human-readable domain names to IPv4/IPv6 addresses and configures mail servers (MX), domain verification (TXT/SPF), and authoritative name servers (NS).
Verifying live DNS records detects propagation delays, misconfigured SPF/DKIM mail records, broken CNAME aliases, and Webhook endpoint resolution failures.
Interactive DNS Record & Propagation Lookup Workspace
Free ISP Engineering & Planning Tools
Precision planning tools for WISPs and fiber operators — RF, optical, power, addressing, and business math. No sign-up required.
Link Budget Calculator
Calculate FSPL, RSSI, and EIRP for wireless links (2.4GHz to 60GHz).
Tower Revenue Calculator
Analyze ISP tower profitability, CAPEX/OPEX, and business Break-Even Point.
GPON Splitter Calculator
Plan optical budgets for PON networks. Calculate splitter and fiber loss.
UPS Runtime Calculator
Estimate battery backup time based on load (Watts) and battery capacity (Ah).
IPv4 Subnet Calculator
CIDR to Subnet Mask, Network Address, Broadcast, and Host Range calculator.
CGNAT Calculator
Plan Carrier-Grade NAT: subscribers per public IPv4, port blocks, and pool capacity.
Data & Bandwidth Converter
Convert Mbps to Gbps, MB to GB, bits to bytes, plus a download time calculator.
Bandwidth Calculator
Plan oversubscription ratios and total backhaul capacity requirements.
ROI Comparison
Compare Kashtrix costs vs legacy platforms (Splynx/Sonar). See how much you can save.
SLA Uptime Calculator
Convert SLA uptime percentages (99.9%) to allowable downtime limits.
MAC Address Lookup
Find the hardware vendor behind any MAC address and decode the OUI bits.
DNS Lookup
Query live A, AAAA, MX, TXT, NS, CNAME and SOA records for any domain.
What Is My IP
See your public IP address, reverse DNS, ISP and location instantly.
IP Location Lookup
Geolocate any IPv4 or IPv6 address: country, city, ISP, ASN and timezone.
CIDR Calculator
Expand a CIDR block to its range, or aggregate an IP range into CIDR blocks.
IPv6 Subnet Calculator
Network, address range, expanded form and subnet counts for any IPv6 prefix.
dBm to Watt Converter
Convert RF power between dBm, mW and watts, and dB gain to a linear ratio.
DNS Lookup
Real-World Calculation Walkthrough
Performing a live DNS query for kashtrix.com
Input Parameters
Calculation Output
DNS Record & Propagation Lookup Engineering FAQs
What is DNS TTL (Time To Live)?
TTL specifies the number of seconds intermediate DNS resolvers may cache a record before querying authoritative name servers for updates.
What is the function of MX and TXT records?
MX records designate mail exchange servers for email routing. TXT records hold domain validation keys, SPF anti-spoofing policies, and DKIM signatures.
How does DNS-over-HTTPS (DoH) improve subscriber privacy?
DoH encrypts DNS queries inside HTTPS (port 443) sessions, preventing third-party eavesdropping and DNS spoofing attacks.
Explore More Free ISP Engineering Tools
CGNAT Calculator
Calculate CGNAT public IPv4 address requirements, subscriber port block allocations, and NAT444 capacity for ISPs and WISPs.
GPON Splitter & Optical Budget Calculator
Calculate GPON optical power loss, splitter attenuation (1:2 to 1:64), fiber distance loss, and ONT rx signal budget.
IPv4 Subnet & CIDR Calculator
Calculate network address, broadcast address, subnet mask, wildcard mask, and usable host ranges for any IPv4 CIDR prefix.
IPv6 Subnet & Prefix Calculator
Calculate IPv6 expanded addresses, subnet ranges, prefix breakdowns, and total /64 subnets from any IPv6 prefix (/48, /56, /64).