Archipelago Monitor Statistics

Archipelago (Ark): CAIDA's active measurement infrastructure serving the network research community since 2007.
Statistical information for the topology traces taken by this individual Ark monitor is displayed below. See the main statistics page for the full list of monitors

---

Prev monitor: san4-us
Prev in US: san4-us
Prev in North America: san4-us

Next monitor: san9-us
Next in US: san9-us
Next in North America: san9-us

To main statistics page

san8-us

DREN
San Diego, US (143)
IPv6 data used (switch to IPv4)

Time range	2026-01-18 20:10 to 2026-01-20 08:15 UTC (1 day 12 hours)
Total traces	481176
Traces with responding destinations	31280 (6.501%)
ASes with responding destinations	7864 (22.063% out of 35644)
Prefixes with responding destinations	27895 (11.906% out of 234299)
Protocol version	v6 (switch to v4)

Generated for cycle 20260118 on 2026-01-20 09:50 UTC

All images can be clicked on for more detailed information.

Median RTT per country and US state

Mapping RTT by political boundaries can reveal where high latency issues are located.

• Median RTT per country and US state

Path Dispersion

The paths taken by different traces show where the majority of a monitor's traffic travels.

• AS Path Dispersion (by AS Hop)
  
  AS connectivity near monitor
  
• AS Path Dispersion (by IP Hop)
  
  AS connectivity near monitor (with IP hop distances preserved)
  
• IP Path Dispersion (by IP Hop)
  
  IP connectivity near monitor
  

Path Length Distributions

Path length distributions show, on aggregate, how well-connected a monitor is to the rest of the Internet.

• CCDF of IP path lengths for responding destinations

  percentile	10th	25th	50th	75th	90th	Max
  IP path length	8	10	12	15	17	32

  
• CCDF of AS path lengths for responding destinations

  percentile	10th	25th	50th	75th	90th	Max
  AS path length	3	4	5	6	7	12

  
• CCDF of IP path lengths for non-responding destinations

  percentile	10th	25th	50th	75th	90th	Max
  IP path length	1	2	8	12	15	35

  
• CCDF of AS path lengths for non-responding destinations

  percentile	10th	25th	50th	75th	90th	Max
  AS path length	1	2	3	5	6	13

  

RTT Distribution

An RTT distribution shows the general latency between a monitor and the rest of the Internet.

• CCDF of destination RTTs

  percentile	10th	25th	50th	75th	90th
  RTT (ms)	25.334	64.129	146.561	187.618	250.608

  
• RTT quartiles vs hop distance
  

RTTs vs. Distance

Comparing RTT with geographical distance helps show if latency is primarily due to distance or other factors.

• RTT density versus geographical distance
  
• RTT quartiles versus geographical distance