I believe this is coming from my crawler for http://getaddr.bitnodes.io/. The crawler is a custom Python script developed to get an estimate of the size of the Bitcoin network at any one time. It simply sends getaddr message recursively to all reachable nodes in the network and keeps the connection active using ping message. The crawler should only maintain 1 OPEN state connection with your node. From your post, it seems like you are seeing multiple CLOSE_WAIT between your node and the crawler after you have closed your Bitcoin-Qt? Do you mind sending me a PM of the list of related CLOSE_WAIT so I can check on this further?

The crawler is actually connecting OUT instead of accepting incoming connection to capture all reachable nodes in the network.

Those are reachable Bitcoin clients (non-mining + mining) in the past 30 days; see http://bitcoin.stackexchange.com/a/19363/11412
Most miners are behind pool so it's unlikely for us to be able to get the actual number of mining nodes.

Is the crawler still trying to connect to your node? If so, please let me know the current IP address for your altcoin node so I can check on the crawler side as well.

I would think being listed in the peer list (getpeerinfo) means the bitcoind has successfully exchanged packets/handshaked with its peers. Even if the restriction is outbound (outgoing packets), it still does not make sense for the multiple nodes from the same /16 to be able to establish connection with my bitcoind.

So the bitcoind built-in /16 restriction (https://github.com/bitcoin/bitcoin/blob/master/src/net.cpp#L1331) is not working?

My bitcoind is configured to accept max. 32 connections, i.e. maxconnections=32 in bitcoin.conf. Now I am seeing this:


They took 70% of my connections. All from the same network with IP address 129.132.230.*. I thought bitcoind is hardcoded to accept only 1 peer per /16 network??

It looks like an attempt to connect to all nodes in the network at once. Perhaps for realtime stats of the network?

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768GB SSD storage
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1536GB SSD storage
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96GB RAM (USD 1.44/hr)
20 CPU cores
1920GB SSD storage
96GB RAM
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All instances come with:
- Intel(R) Xeon(R) CPU E5-2680 v2 Ivy Bridge @ 2.80GHz (server-grade processor)
- Datacenter-grade SSD with battery-backed hardware RAID
- Max. 40Gbps inbound bandwidth
- Native IPv6 support
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Hey guys, do we have a mirror of bitcointalk.org? I recall someone brought up the idea of mirroring and allowing search there. The current search is too restrictive. Google's site:bitcointalk.org <QUERY> works as expected but its incomplete and delayed by days or weeks.

FYI, the project page has moved to http://getaddr.bitnodes.io/

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1GB RAM (USD 0.015/hr)
1 CPU core
24GB SSD storage
1GB RAM
Max. 125Mbps outbound bandwidth

2GB RAM (USD 0.03/hr)
2 CPU cores
48GB SSD storage
2GB RAM
Max. 250Mbps outbound bandwidth

4GB RAM (USD 0.06/hr)
4 CPU cores
96GB SSD storage
4GB RAM
Max. 500Mbps outbound bandwidth

8GB RAM (USD 0.12/hr)
6 CPU cores
192GB SSD storage
8GB RAM
Max. 1Gbps outbound bandwidth

16GB RAM (USD 0.24/hr)
8 CPU cores
384GB SSD storage
16GB RAM
Max. 2Gbps outbound bandwidth

32GB RAM (USD 0.48/hr)
12 CPU cores
768GB SSD storage
32GB RAM
Max. 4Gbps outbound bandwidth

48GB RAM (USD 0.72/hr)
16 CPU cores
1152GB SSD storage
48GB RAM
Max. 6Gbps outbound bandwidth

64GB RAM (USD 0.96/hr)
20 CPU cores
1536GB SSD storage
64GB RAM
Max. 8Gbps outbound bandwidth

96GB RAM (USD 1.44/hr)
20 CPU cores
1920GB SSD storage
96GB RAM
Max. 10Gbps outbound bandwidth

All instances come with:
- Intel(R) Xeon(R) CPU E5-2680 v2 Ivy Bridge @ 2.80GHz (server-grade processor)
- Datacenter-grade SSD with battery-backed hardware RAID
- Max. 40Gbps inbound bandwidth
- Native IPv6 support
- Your choice of location and Linux 64-bit distribution
- Max. 5 servers per user

The current map shown on bitnodes.io is based on run #7. If we want to find out when did China top the chart, we probably need a dataset from last month or the first week of May which we don't have; run#7 is our starting point. I am currently working on scheduling the data collection to chart the daily/weekly changes.

Hi folks,

As part of my attempt to learn more of the Bitcoin protocol and also to get at a rough estimate of the current size of the Bitcoin network, I've started working on https://github.com/ayeowch/bitnodes.

The project is essentially a Python script that sends out getaddr (https://en.bitcoin.it/wiki/Protocol_specification#getaddr) message to all peering nodes in a recursive manner to find all the nodes in the network. It is far from complete as I have yet to arrive at a final number myself but I am sending this out anyway to get more feedbacks and also to share with those that may be interested on this metric as well.

Hi guys,

Is the relay field (bool/1 byte) required in all version packets coming from client with protocol version >= 70001 or my interpretation of https://en.bitcoin.it/wiki/Protocol_specification#version is incorrect?

I am looking for a rough number of active nodes with port 8333 open.
Wouldn't a recursive getaddr be able to do this?

1) https://en.bitcoin.it/wiki/Protocol_specification#getaddr
2) http://nmap.org/nsedoc/scripts/bitcoin-getaddr.html

Has anyone been able to get the number of active nodes in the entire Bitcoin network?

There were some effort made in this area a while back but no recent/updated data:
1) https://bitcointalk.org/index.php?topic=2346.0 (https://smsz.net/btcStats/bitcoin.kml) - no longer updated
2) http://bitcoinstatus.rowit.co.uk/ - no longer updated
3) http://www.bitcoinmap.com/ - no longer updated
4) http://www.weusecoins.com/globe-bitcoin/ - gone

Blockchain.info has this but only shows nodes that they are/were connected to:
http://blockchain.info/nodes-globe?series=onlineNow

FYI, the SSL cert for the wiki site has expired:
https://en.bitcoin.it/wiki/Main_Page
There's no obvious owner on the page that I can contact.