AS205358 - NeoFiber NEOFIBER SRLSPARFC 4890 ✓RPKI ✓ 1/1ASPA -

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AS overview

Test target: 2a12:da40::1 · static prefix probe · address space: PA · prefixes announced: 1

prefix(es): 2a12:da40::/32

Targets & per-vantage-point probe results (1 target(s) across 7 vantage point(s))

Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback

Target IP / hostnameSourceSRB host (SOX, Belgrade)DE host (Berlin)DE host (Düsseldorf)NL host (go6lab)ITA host (Karsolink)SLO host (6connect)SLO host (T-2)
ping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reached
2a12:da40::1prbrefusedrefusedrefusedrefusedrefusedrefused??refusedrefusedrefusedrefusedrefusedrefused

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

PrefixRPKI stateReasonCovering VRP(s)
2a12:da40::/32✓ validmatched VRP (correct origin, length within maxLength)AS205358 /32 maxLen 32 (ripe)

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

We probed 35 arbitrary IPv6 address(es) inside AS205358's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:7f8:112::9 at hop 18 - that router does not answer ICMPv6 Echo. This is not in AS205358'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 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:09:17Z

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

multi-vantage path diagram for AS205358

From SRB host (SOX, Belgrade)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 57.6ms
4/4
Echo 1500B (DF) 57.6ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a09:ab81::10.3ms0%*AS60733PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2sox-pn.sox.rs
2001:7f8:1e:8::3a
0.3ms0%AS13004SOX - Serbian Open Exchange DOO, RS
32001:7f8:1e:8::3d0.3ms0%AS13004SOX - Serbian Open Exchange DOO, RS
42001:67c:128c::69917.0ms0%-NA
52a12:da40::154.9ms0%AS205358NeoFiber - NEOFIBER SRLS, IT

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  _gateway                                              0.515ms 
 1:  _gateway                                              0.602ms 
 2:  sox-pn.sox.rs                                         0.607ms 
 3:  2001:7f8:1e:8::3d                                     0.711ms asymm  2 
 4:  2001:67c:128c::699                                   19.669ms 
 5:  2a12:da40::1                                         56.193ms reached
     Resume: pmtu 1500 hops 5 back 11 

From DE host (Berlin)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 42.3ms
4/4
Echo 1500B (DF) 42.3ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-13-178.gw01.ber01.as59645.net
2a06:d1c1:100:b::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ae0-2453.cr10.ber01.lwlcom.net
2a06:d1c0::dead:beef:1c02
0.7ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
3ae0-10.cr10.ber03.lwlcom.net
2a00:c380:b200:230::220
0.8ms0%AS50629LWLCOM - LWLcom GmbH, DE
4ae0-15.cr11.dtm01.lwlcom.net
2a00:c380:b200:230::5
8.3ms0%AS50629LWLCOM - LWLcom GmbH, DE
5ae0-10.cr10.dtm02.lwlcom.net
2a00:c380:b200:230::255
8.5ms0%AS50629LWLCOM - LWLcom GmbH, DE
6ae0-50.cr10.dus02.lwlcom.net
2a00:c380:b200:230::24
8.5ms0%AS50629LWLCOM - LWLcom GmbH, DE
7ae0-10.cr10.dus01.lwlcom.net
2a00:c380:b200:230::187
8.4ms0%AS50629LWLCOM - LWLcom GmbH, DE
8ae6-60.cr10.ams01.lwlcom.net
2a00:c380:b200:230::213
11.3ms0%AS50629LWLCOM - LWLcom GmbH, DE
92001:7f8:1::a503:9120:140.2ms0%-NA
102a01:9a80:0:2f::f36.6ms0%AS39120CONVERGENZE-AS - Convergenze S.p.A., IT
112a05:4140:2::239.7ms0%AS212271C1V - Cinzia Tocci trading as Lumanex Srl, IT
122a12:da40::142.9ms0%AS205358NeoFiber - NEOFIBER SRLS, IT

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.617ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.463ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.215ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          1.248ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.771ms asymm  5 
 5:  ae0-10.cr10.dtm02.lwlcom.net                          8.986ms asymm  6 
 6:  ae0-20.cr10.dus04.lwlcom.net                          8.912ms asymm  5 
 7:  ae0-10.cr10.dus01.lwlcom.net                          8.818ms asymm  4 
 8:  ae6-60.cr10.ams01.lwlcom.net                         11.561ms asymm  5 
 9:  2001:7f8:1::a503:9120:1                              38.541ms asymm 12 
10:  2a01:9a80:0:2f::f                                    40.616ms asymm 13 
11:  2a05:4140:2::2                                       43.710ms asymm 15 
12:  2a12:da40::1                                         41.716ms reached
     Resume: pmtu 1500 hops 12 back 15 

From DE host (Düsseldorf)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 25.2ms
4/4
Echo 1500B (DF) 25.1ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-12-142.gw01.dus01.as59645.net
2a06:d1c1:100:d::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2eth1-0-12-h5594.edge5-dus1.bb.wiit.network
2001:4ba0:92f4:3::1
1.9ms0%AS24961MYLOC-AS - WIIT AG, DE
3*---
4lag11.core3-dus1.bb.wiit.network
2001:4ba0:ffe9:115::3
0.2ms0%AS24961MYLOC-AS - WIIT AG, DE
5lag2.core1-dus-ix.bb.wiit.network
2001:4ba0:ffe9:4f::1
0.5ms0%AS24961MYLOC-AS - WIIT AG, DE
6de-cix.convergenze.it
2001:7f8::98d0:0:1
22.5ms0%-NA
72a01:9a80:0:2f::f21.9ms0%AS39120CONVERGENZE-AS - Convergenze S.p.A., IT
8*-0%-
92a12:da40::125.2ms0%AS205358NeoFiber - NEOFIBER SRLS, IT

tracepath -6

 1?: [LOCALHOST]                        0.021ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.361ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.341ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.366ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.441ms 
 5:  lag8.core1-dus-ix.bb.wiit.network                     0.528ms 
 6:  de-cix.convergenze.it                                22.653ms asymm  3 
 7:  2a01:9a80:0:2f::f                                    22.488ms asymm 12 
 8:  2a05:4140:2::2                                       25.333ms asymm 14 
 9:  2a12:da40::1                                         25.253ms reached
     Resume: pmtu 1500 hops 9 back 14 

From NL host (go6lab)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 41.1ms
4/4
Echo 1500B (DF) 40.4ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::23.1ms0%AS203993GNA-DC1-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1
3.9ms0%*AS203993GNA-DC1-AS - S.J.M. Steffann, NL
32a00:1ca8:1::1943.8ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:335.2ms0%AS50673Serverius-as - Serverius Holding B.V., NL
52001:7f8:1::a503:9120:136.8ms0%-NA
62a01:9a80:0:2f::f34.9ms0%AS39120CONVERGENZE-AS - Convergenze S.p.A., IT
72a05:4140:2::242.4ms0%AS212271C1V - Cinzia Tocci trading as Lumanex Srl, IT
82a12:da40::141.9ms0%AS205358NeoFiber - NEOFIBER SRLS, IT

tracepath -6

 1?: [LOCALHOST]                        0.069ms pmtu 1500
 1:  2a00:8642:42::2                                       1.993ms 
 1:  2a00:8642:42::2                                       1.892ms 
 2:  gw.friends.steffann.nl                                3.224ms 
 3:  2a00:1ca8:1::194                                      5.291ms 
 4:  2a03:3f40::10:33                                      7.244ms 
 5:  2001:7f8:1::a503:9120:1                              35.429ms 
 6:  2a01:9a80:0:2f::f                                    36.729ms 
 7:  2a05:4140:2::2                                       40.392ms asymm 12 
 8:  2a12:da40::1                                         39.272ms reached
     Resume: pmtu 1500 hops 8 back 12 

From ITA host (Karsolink)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 19.4ms
3/4
Echo 1500B (DF) 19.4ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1karsolink-01.net.karsolink.com
2a12:d8c0:105a:9001::1
0.5ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
2*---
3*-0%-
42001:7f8:112::1217.9ms0%-NA
52a01:9a80:0:2f::f17.9ms0%AS39120CONVERGENZE-AS - Convergenze S.p.A., IT
62a05:4140:2::219.0ms0%AS212271C1V - Cinzia Tocci trading as Lumanex Srl, IT
72a12:da40::119.1ms0%AS205358NeoFiber - NEOFIBER SRLS, IT

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        1.044ms 
 1:  karsolink-01.net.karsolink.com                        1.107ms 
 2:  no reply
 3:  2a12:d8c0:109f:106::a2                                3.805ms 
 4:  2001:7f8:112::12                                     18.422ms 
 5:  2a01:9a80:0:2f::f                                    18.753ms 
 6:  2a05:4140:2::2                                       19.504ms asymm 11 
 7:  2a12:da40::1                                         19.864ms reached
     Resume: pmtu 1500 hops 7 back 11 

From SLO host (6connect)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 29.6ms
4/4
Echo 1500B (DF) 29.5ms
yes
Type 1 dest-unreach
443,80
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
2ccr-to-fw-ccr1-gw-lju.6connect.com
2607:fae0:a000:2::2
0.7ms-AS80386CONNECT - 6connect, Inc., US
32a00:ee1:800:9::12.1ms30%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
42a00:ee0:1:10::21.2ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
5de-cix.convergenze.it
2001:7f8::98d0:0:1
30.9ms0%-NA
62a01:9a80:0:2f::f30.3ms0%AS39120CONVERGENZE-AS - Convergenze S.p.A., IT
72a05:4140:2::228.9ms0%AS212271C1V - Cinzia Tocci trading as Lumanex Srl, IT
82a12:da40::128.8ms0%AS205358NeoFiber - NEOFIBER SRLS, IT

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

tracepath -6

 1?: [LOCALHOST]                        0.025ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.578ms 
 1:  fw1-lju.6connect.com                                  0.582ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.181ms 
 4:  2a00:ee0:1:10::2                                      1.420ms asymm  3 
 5:  2a00:ee0:1:10::2                                      1.804ms pmtu 1500
 5:  de-cix.convergenze.it                                30.937ms asymm 10 
 6:  2a01:9a80:0:2f::f                                    30.803ms asymm 11 
 7:  2a05:4140:2::2                                       31.135ms asymm 10 
 8:  2a12:da40::1                                         29.089ms reached
     Resume: pmtu 1500 hops 8 back 10 

From SLO host (T-2)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4
Echo small (56B) 23.0ms
4/4
Echo 1500B (DF) 23.3ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*-0%*-
22a01:260:1::2252.4ms0%*AS34779T-2-AS - T-2, d.o.o., SI
32a01-260-1-1--9a.core6.t-2.net
2a01:260:1:1::9a
2.6ms0%*AS34779T-2-AS - T-2, d.o.o., SI
42a01-260-1-1--38.core6.t-2.net
2a01:260:1:1::38
2.6ms0%*AS34779T-2-AS - T-2, d.o.o., SI
5*---
6*-0%-
7*---
82001:7f8:10::3:912025.0ms0%-NA
92001:7f8:10::3:912025.6ms0%-NA
102a05:4140:2::222.2ms0%AS212271C1V - Cinzia Tocci trading as Lumanex Srl, IT
112a12:da40::122.5ms0%AS205358NeoFiber - NEOFIBER SRLS, IT

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.885ms 
 1:  2a01:261:313:b814::1                                  1.122ms 
 2:  2a01:260:1::225                                       3.693ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.298ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        3.126ms asymm  3 
 5:  port-channel1.core1.zag2.he.net                      11.194ms asymm  7 
 6:  port-channel1.core1.zag2.he.net                      10.107ms asymm  7 
 7:  e0-36.core2.rom1.he.net                              26.287ms 
 8:  e0-36.core2.rom1.he.net                              25.565ms asymm  7 
 9:  2a01:9a80:0:2f::f                                    25.542ms asymm  7 
10:  2a05:4140:2::2                                       22.914ms asymm  7 
11:  2a05:4140:2::2                                       23.382ms asymm  7 
12:  2a12:da40::1                                         23.159ms reached
     Resume: pmtu 1500 hops 12 back 7