AS59419 - SIDERA-AS Sidera ICTease S.r.lPI/PARPKI ✓ 3/3ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS59419 announces 3 IPv6 prefix(es) to the global routing table - that’s the part that BGP and our route-server scrape confirm. But our active discovery (curated hostnames, holder-derived domains, authoritative DNS NS/SOA/MX, certificate-transparency hostnames, RIPE Atlas, RDAP, IPv6 Hitlist) found no ICMPv6-responsive host inside the prefix on either vantage, and a yarrp pass against random addresses inside the prefix produced zero in-prefix hops (no router on the path through the AS replied with Time-Exceeded for any random target). That combination usually means the announcement is configured but the addresses inside aren’t in active use yet. The BGP route is there; the operational deployment is still ahead.

AS overview

Test target: 2a0b:aa04::1 · (no live host found) · address space: mixed · prefixes announced: 3

prefix(es): 2a0b:aa04::/30, 2a0b:aa00::/29, 2a0b:aa00::/30

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO peering

Not an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member, but our traceroute path crosses the MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO LAN from SLO host (6connect) - reached via an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO-resident transit operator.

RPKI & ASPA

3 of 3 prefix(es) covered by a valid ROA.

PrefixRPKI stateReasonCovering VRP(s)
2a0b:aa04::/30✓ validmatched VRP (correct origin, length within maxLength)AS59419 /29 maxLen 48 (ripe)
2a0b:aa00::/29✓ validmatched VRP (correct origin, length within maxLength)AS59419 /29 maxLen 48 (ripe)
2a0b:aa00::/30✓ validmatched VRP (correct origin, length within maxLength)AS59419 /29 maxLen 48 (ripe)

Random-IP probe (yarrp) into the AS' prefixes

We probed 30 arbitrary IPv6 address(es) inside AS59419's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:490:f000:e::2 at hop 20 - that router answers ICMPv6 Echo. This is not in AS59419's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-05-25T12:35:44Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a0b:aa04::1icmp6-echono_echo2026-05-25T12:35:44Z
karsolink2a12:d8c0:105a:9001::a1542a0b:aa04::1icmp6-echono_echo2026-05-25T12:46:55Z
odin2607:fae0:a000::422a0b:aa04::1icmp6-echono_echo2026-05-25T12:35:19Z

Attempt log (go6lab):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: [Errno 113] No route to host
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (karsolink):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: [Errno 113] No route to host
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (odin):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: [Errno 113] No route to host
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

To match the corresponding ICMPv6 packet on your side (host firewall, AS edge, or transit tap), look for our PTBs around the timestamps above:

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a12:d8c0:105a:9001::a154)'

If you see our PTBs arriving but the destination's TCP/Echo flow does not shrink, the drop is in the destination kernel (cause 3 below). If you don't see them at all, drop is upstream of you (cause 2). If you only see them from one of our two source IPs, the drop is path-asymmetric — one transit on the asymmetric route is filtering, the other is not.

From NL host (go6lab)   transit only unreachable

filter likely at: past AS20811 (BRENNERCOM-AS) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::31.5ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1		2.3ms0%*AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
32a00:1ca8:1::1943.4ms10%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:412.2ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5*---
6*---
72001:978:3::264.1ms0%AS174COGENT-174 - Cogent Communications, LLC, US
82001:2034:a:2b44.0ms0%-
9*---
102001:1bd0:0:2::526.3ms0%AS28716RETELIT-AS - Retelit Digital Services S.p.A., IT
11retelitdigital-ic-375445.ip.twelve99-cust.net
2001:2035:0:24bc::2		26.4ms0%AS1299TWELVE99 - Arelion Sweden AB, SE
122001:1bd0:0:2::523.8ms0%AS28716RETELIT-AS - Retelit Digital Services S.p.A., IT
132001:1bd0:1:55::231.8ms30%AS28716RETELIT-AS - Retelit Digital Services S.p.A., IT
142a02:490:f000:f::231.4ms80%AS20811BRENNERCOM-AS - Retelit Digital Services S.p.A., IT

Rate-limited ICMPv6: hop 3, hop 13, hop 14 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.034ms pmtu 1500
 1:  2a00:8642:42::3                                       1.404ms 
 1:  2a00:8642:42::3                                       1.565ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      3.188ms 
 4:  2a03:3f40::10:41                                      3.451ms 
 5:  2001:978:2:40::3:1                                    4.310ms 
 6:  no reply
 7:  2001:978:3::ca                                        4.250ms asymm  6 
 8:  adm-bb2-link.ip.twelve99.net                          4.213ms asymm  7 
 9:  no reply
10:  mno-b3-link.ip.twelve99.net                          29.389ms asymm  9 
11:  retelitdigital-ic-375445.ip.twelve99-cust.net        24.452ms asymm  7 
12:  2001:1bd0:0:2::5                                     24.153ms asymm  8 
13:  ???                                                  31.472ms asymm  9 
14:  2a02:490:f000:f::2                                   29.834ms !H
     Resume: pmtu 1500

From ITA host (Karsolink)   transit only unreachable

filter likely at: past AS20811 (BRENNERCOM-AS) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*-0%*-
2*-0%*-
32a12:d8c0:109f:106::a23.2ms0%AS204471KARSOLINK - 2S Computers SRL, IT
4retelit.topix.it
2001:7f8:23:ffff::26		10.4ms0%-NA
52001:1bd0:0:2::510.1ms0%AS28716RETELIT-AS - Retelit Digital Services S.p.A., IT
6*-40%-
72a02:490:f000:f::214.4ms90%AS20811BRENNERCOM-AS - Retelit Digital Services S.p.A., IT

Rate-limited ICMPv6: hop 6, hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.701ms 
 2:  2a12:d8c0:109f:121::a1                                0.749ms 
 3:  2a12:d8c0:109f:106::a2                                3.636ms 
 4:  retelit.topix.it                                     10.593ms asymm  7 
 5:  2001:1bd0:0:2::5                                     10.911ms asymm  6 
 6:  ???                                                  15.630ms asymm  8 
 7:  2a02:490:f000:f::2                                   15.391ms !H
     Resume: pmtu 1500

From SLO host (6connect)   transit only unreachable

filter likely at: past AS20811 (BRENNERCOM-AS) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2		0.3ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
32a03:a100:0:201:1::10.5ms0%AS56635XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4e0-1.core1.lju1.he.net
2001:470:1:5be::1		2.2ms0%AS6939HURRICANE - Hurricane Electric LLC, US
5*---
6port-channel1.core1.zag2.he.net
2001:470:0:2ea::2		4.1ms0%AS6939HURRICANE - Hurricane Electric LLC, US
7*---
8brennercom-v6.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO
2001:7f8:b:100:1d1:a5d2:811:88		12.9ms0%-NA
9*-80%-
10*---
112a02:490:f000:f::215.7ms-AS20811BRENNERCOM-AS - Retelit Digital Services S.p.A., IT

Rate-limited ICMPv6: hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.569ms 
 1:  fw1-lju.6connect.com                                  0.432ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.812ms 
 4:  e0-1.core1.lju1.he.net                                2.063ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.230ms 
 7:  no reply
 8:  brennercom-v6.mix-it.net                             13.424ms asymm  9 
 9:  2a02:490:f000:f::2                                   16.160ms !H
     Resume: pmtu 1500