Sure is on a few blacklists and Spamhaus-ZEN and CBL are commonly used.
                SuperTool Beta
            
            
            <input name="ctl00$ContentPlaceHolder1$txtToolInput" value="blacklist:89.241.71.100" id="ctl00_ContentPlaceHolder1_txtToolInput" tabindex="1" class="tools_lookup_textbox" type="text">
            <input name="ctl00$ContentPlaceHolder1$btnAction" value="Lookup" onclick="javascript:__doPostBack('ctl00$ContentPlaceHolder1$btnAction','')" id="ctl00_ContentPlaceHolder1_btnAction" tabindex="1" class="tools_lookup_button" type="button">
<style type="text/css">
</style>
    #tblAboutBox
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        width: 533px;
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    .style3
    {
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    .style4
    {
        width: 61px;
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    .style5
    {
        width: 61px;
        text-decoration: underline;
        font-weight: bold;
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    .style6
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        width: 16px;
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    .style7
    {
        text-decoration: underline;
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    .style9
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    }
    .style15
    {
        width: 16px;
        height: 22px;
    }
    .style16
    {
        height: 22px;
    }
    
    Checking 89.241.71.100 against 105 known blacklists...
Listed 5 times with 7 timeouts.
  <p>Sure is on a few blacklists and Spamhaus-ZEN and CBL are commonly used.
</p><p><span id="ctl00_ContentPlaceHolder1_UpdatePanel1"><h1>
                SuperTool <sup><span class="supertool_beta">Beta</span></sup>
            </h1>
            <div class="tools_lookup_label">
                Command:
            </div>
            <input name="ctl00$ContentPlaceHolder1$txtToolInput" value="blacklist:89.241.71.100" id="ctl00_ContentPlaceHolder1_txtToolInput" tabindex="1" class="tools_lookup_textbox" type="text">
            <input name="ctl00$ContentPlaceHolder1$btnAction" value="Lookup" onclick="javascript:__doPostBack('ctl00$ContentPlaceHolder1$btnAction','')" id="ctl00_ContentPlaceHolder1_btnAction" tabindex="1" class="tools_lookup_button" type="button">
            
<style type="text/css">
    #tblAboutBox
    {
        width: 533px;
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    .style3
    {
        width: 402px;
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    .style4
    {
        width: 61px;
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    .style5
    {
        width: 61px;
        text-decoration: underline;
        font-weight: bold;
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    .style6
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        width: 16px;
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    .style7
    {
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        font-weight: bold;
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    .style8
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    .style9
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        color: #CCCCCC;
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    .style10
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        width: 61px;
        color: #CCCCCC;
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    .style11
    {
        color: #CCCCCC;
    }
    .style12
    {
        color: #CCCCCC;
        text-decoration: underline;
        font-weight: bold;
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    .style13
    {
        color: #FF3300;
        font-weight: bold;
    }
    .style14
    {
        width: 61px;
        height: 22px;
    }
    .style15
    {
        width: 16px;
        height: 22px;
    }
    .style16
    {
        height: 22px;
    }
</style>
<span id="ctl00_ContentPlaceHolder1_stHistoryPane2_lblResultStream">
<div>
<table style="width: 97%;" class="app_header">
    <tbody><tr>
        <td style="width: 100px;">
            <span id="ctl00_ContentPlaceHolder1_stHistoryPane2_StResultBlob1_lblInputText">blacklist:89.241.71.100</span></td>
        <td style="width: 50px;">
            
</td>
        <td style="width: 150px; text-align: right;">
            &nbsp;&nbsp;
            <span id="ctl00_ContentPlaceHolder1_stHistoryPane2_StResultBlob1_lblActionType" style="color: Silver;">blacklist</span>&nbsp;&nbsp;
            <a onmouseover="if (animationTimerID == 0) {document.getElementById('ctl00_ContentPlaceHolder1_txtToolInput').value = 'blacklist:89.241.71.100 ';}" onmousedown="javascript:ActionButtonPostBack();" href="javascript:ActionButtonPostBack();"><img src="http://www.mxtoolbox.com/Public/images/refresh_grey.gif" border="0"></a>         
        </td>
    </tr>
</tbody></table>
<div id="ctl00_ContentPlaceHolder1_stHistoryPane2_StResultBlob1_pnlSuggestion">
	
    
    <table id="ctl00_ContentPlaceHolder1_stHistoryPane2_StResultBlob1_tblSuggestion" style="width: 547px; height: 8px;" border="3" bordercolor="red" cellpadding="1" cellspacing="0" width="547">
		<tbody><tr>
			<td valign="top">
                <font size="2"><strong>
                <span id="ctl00_ContentPlaceHolder1_stHistoryPane2_StResultBlob1_lblCTA_HTML"><font size="2"><img src="http://www.mxtoolbox.com/public/images/Listed.gif"><strong>&nbsp;We notice you are on a blacklist.&nbsp; <a href="http://www.mxtoolbox.com/BlacklistSuggestions.aspx">Click here for some suggestions</a></strong></font></span>
                </strong></font>
            </td>
		</tr>
	</tbody></table>
	
    
</div>    
<span id="ctl00_ContentPlaceHolder1_stHistoryPane2_StResultBlob1_lblResultText" style="font-size: 16pt;"></span>
    <span id="ctl00_ContentPlaceHolder1_stHistoryPane2_StResultBlob1_lblResultTextSmall">Checking 89.241.71.100 against 105 known blacklists...
<b>Listed 5 times with 7 timeouts.</b>
<table class="GridData" width="600"><tbody><tr><th>Blacklist</th><th width="75">Status</th><th>Reason</th><th>TTL</th><th>ResponseTime</th></tr><tr><td><a href="http://cbl.abuseat.org/">CBL</a></td><td><img src="http://www.mxtoolbox.com/public/images/btn_red.gif">&nbsp;LISTED</td><td>Blocked - see <a href="http://cbl.abuseat.org/lookup.cgi?ip=89.241.71.100">Detail</a> 
Return codes were: 127.0.0.2</td><td>3600</td><td align="right">203</td></tr><tr><td><a href="http://www.five-ten-sg.com/blackhole.php">FIVETEN</a></td><td><img src="http://www.mxtoolbox.com/public/images/btn_red.gif">&nbsp;LISTED</td><td>miscellaneous address blocks that have sent spam here 
Return codes were: 127.0.0.2</td><td>864000</td><td align="right">281</td></tr><tr><td><a href="http://www.spamhaus.org/">Spamhaus-ZEN</a></td><td><img src="http://www.mxtoolbox.com/public/images/btn_red.gif">&nbsp;LISTED</td><td><a href="http://www.spamhaus.org/query/bl?ip=89.241.71.100">Detail</a> 
Return codes were: 127.0.0.10, 127.0.0.4</td><td>900</td><td align="right">265</td></tr><tr><td><a href="http://www.uceprotect.net/">UCEPROTECTL2</a></td><td><img src="http://www.mxtoolbox.com/public/images/btn_red.gif">&nbsp;LISTED</td><td>Net
 89.240.0.0/15 is UCEPROTECT-Level2 listed because 1484 abusers are 
hosted by OPALTELECOM-AS Opal Telecom/AS13285 there. See: <a href="http://www.uceprotect.net/rblcheck.php?ipr=89.241.71.100">Detail</a> 
Return codes were: 127.0.0.2</td><td>2100</td><td align="right">250</td></tr><tr><td><a href="http://www.uceprotect.net/">UCEPROTECTL3</a></td><td><img src="http://www.mxtoolbox.com/public/images/btn_red.gif">&nbsp;LISTED</td><td>Your ISP OPALTELECOM-AS Opal Telecom/AS13285 is UCEPROTECT-Level3 listed for hosting a total of 28594 abusers. See: <a href="http://www.uceprotect.net/rblcheck.php?ipr=89.241.71.100">Detail</a> 
Return codes were: 127.0.0.2</td><td>2100</td><td align="right">250</td></tr></tbody></table></span></div></span></span> 
</p>