Measurements run from our network in Izmir. Up to 20 queries per minute.
Ready to query
Pick a tool and enter a target — results stream in line by line.
Networks crossed
Latency profile
Traffic leaves via the default route. The details below belong to the default route, not to the queried address.
- Queried
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- Matching route
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- Address family
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| # | Address | Network | Location | Loss | Latency |
|---|
Loss on intermediate hops is usually the router rate-limiting its ICMP replies, not real packet loss. The value that matters is the one on the LAST hop.
Speed test
A real measurement between your browser and our server in Izmir. We are on a 10 Gbit port.
A browser measurement also reflects the limits of your device and line; use iperf3 below for a definitive result.
Test files
curl -o /dev/null https://lg.alastyr.com/dl/1GB.bin
The 10 GB file is limited to one concurrent connection per IP address.
iperf3
iperf3 -c lg.alastyr.com -p 5201 -P 8 -t 20
iperf3 -c lg.alastyr.com -p 5201 -P 8 -t 20 -R
Ports 5201–5205. A single stream is not enough at 10 Gbit — -P 8 parallel streams are required.
Frequently asked questions
What is a Looking Glass?
A Looking Glass is a public tool that lets you run measurements from inside an internet service provider's network. Instead of running from your own computer, ping, traceroute and BGP queries run from Alastyr's backbone in Izmir. That makes it possible to tell whether a problem is on your own line or in the networks in between.
Where exactly do the measurements run from?
Every measurement runs on a server inside our own data centre in Izmir, on the Alastyr network, AS3188. The server is connected to a 10 Gbit port and reaches the internet over three separate transit providers: Turk Telekom, TurkNet and Netdirekt.
What do I see in a BGP query?
When you enter an IP address or a prefix, we show how we learn that destination: the announced prefix, the origin autonomous system (AS) and the AS chain towards it. When our three transits offer different paths for the same prefix we list them side by side and mark the one our router selected.
What does RPKI "Valid" mean?
RPKI cryptographically records which autonomous system is authorised to announce a given IP block. "Valid" means the announcing AS matches a signed ROA record. "Invalid" points to a possible route hijack. We do not ask a third party for this: our own validator runs on this server, fetching and verifying the data from the repositories of the five regional internet registries.
Why is the network name empty for some traceroute hops?
Operators often use addresses on their internal links that are never announced to the internet. Such an address appears in no routing table, so there is no AS number attached to it. We label these as "unannounced address", and private network addresses as "private address".
Why is my speed test result lower than expected?
A browser-based measurement does not test our line alone: it measures your device, your local network,
your Wi-Fi link and every operator in between at the same time. To see the real ceiling of your connection,
run the iperf3 commands on this page with parallel streams (-P 8).
BGP table
Receiving the full table from our MX480 over iBGP.
API
Every query is also available as a stream over /api/run. Result links are shareable.