[REN-BGP-stats-all] IPv4 R&E Routing Table Report - Internet2 (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Mon Jul 21 22:00:39 UTC 2025
IPv4 R&E Routing Table Report 22:00 GMT Mon 21 Jul, 2025
IPv4 BGP Table (R&E) as seen at Internet2.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/Internet2/
Analysis Summary
----------------
BGP routing table entries examined: 23072
Prefixes after maximum aggregation (per Origin AS): 12980
Deaggregation factor: 1.78
Unique aggregates announced (without unneeded subnets): 14927
Number of IPv4 prefixes with a valid ROA: 11839
Number of IPv4 prefixes with an invalid ROA: 14
Number of IPv4 prefixes with no ROA: 11219
Total ASes present in the Internet Routing Table: 2823
Prefixes per ASN: 8.17
Origin-only ASes present in the Internet Routing Table: 2456
Origin ASes announcing only one prefix: 1095
Transit ASes present in the Internet Routing Table: 367
Transit-only ASes present in the Internet Routing Table: 60
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 3.4
Max AS path length visible: 15
Max AS path prepend of ASN (395156) 12
Prefixes from unregistered ASNs in the Routing Table: 33
Number of instances of unregistered ASNs: 33
Number of 32-bit ASNs allocated by the RIRs: 46911
Number of 32-bit ASNs visible in the Routing Table: 722
Prefixes from 32-bit ASNs in the Routing Table: 1927
Number of bogon 32-bit ASNs visible in the Routing Table: 0
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 8
Number of addresses announced to Internet: 228944944
Equivalent to 13 /8s, 165 /16s and 108 /24s
Percentage of available address space announced: 6.2
Percentage of allocated address space announced: 6.2
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 99.6
Total number of prefixes smaller than registry allocations: 3202
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 4862
Total APNIC prefixes after maximum aggregation: 2345
APNIC Deaggregation factor: 2.07
Prefixes being announced from the APNIC address blocks: 4888
Unique aggregates announced from the APNIC address blocks: 2713
APNIC Region origin ASes present in the Internet Routing Table: 598
APNIC Prefixes per ASN: 8.17
APNIC Region origin ASes announcing only one prefix: 248
APNIC Region transit ASes present in the Internet Routing Table: 53
Average APNIC Region AS path length visible: 4.2
Max APNIC Region AS path length visible: 13
Number of APNIC region 32-bit ASNs visible in the Routing Table: 243
Number of APNIC addresses announced to Internet: 45380160
Equivalent to 2 /8s, 180 /16s and 114 /24s
APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 63488-64098, 64297-64395, 131072-155961
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8,
163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,
ARIN Region Analysis Summary
----------------------------
Prefixes being announced by ARIN Region ASes: 11978
Total ARIN prefixes after maximum aggregation: 7057
ARIN Deaggregation factor: 1.70
Prefixes being announced from the ARIN address blocks: 11830
Unique aggregates announced from the ARIN address blocks: 8161
ARIN Region origin ASes present in the Internet Routing Table: 1312
ARIN Prefixes per ASN: 9.02
ARIN Region origin ASes announcing only one prefix: 466
ARIN Region transit ASes present in the Internet Routing Table: 159
Average ARIN Region AS path length visible: 3.0
Max ARIN Region AS path length visible: 15
Number of ARIN region 32-bit ASNs visible in the Routing Table: 228
Number of ARIN addresses announced to Internet: 118866608
Equivalent to 7 /8s, 21 /16s and 194 /24s
ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 62464-63487, 64198-64296, 393216-402332
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8,
67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8,
74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8,
100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8,
131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8,
139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8,
148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8,
159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8,
167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8,
184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8,
207/8, 208/8, 209/8, 214/8, 215/8, 216/8,
RIPE Region Analysis Summary
----------------------------
Prefixes being announced by RIPE Region ASes: 3653
Total RIPE prefixes after maximum aggregation: 2904
RIPE Deaggregation factor: 1.26
Prefixes being announced from the RIPE address blocks: 3791
Unique aggregates announced from the RIPE address blocks: 3144
RIPE Region origin ASes present in the Internet Routing Table: 665
RIPE Prefixes per ASN: 5.70
RIPE Region origin ASes announcing only one prefix: 295
RIPE Region transit ASes present in the Internet Routing Table: 105
Average RIPE Region AS path length visible: 3.7
Max RIPE Region AS path length visible: 13
Number of RIPE region 32-bit ASNs visible in the Routing Table: 157
Number of RIPE addresses announced to Internet: 58138880
Equivalent to 3 /8s, 119 /16s and 33 /24s
RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
59392-61439, 61952-62463, 64396-64495
196608-216475
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8,
81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8,
88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8,
95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8,
185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,
LACNIC Region Analysis Summary
------------------------------
Prefixes being announced by LACNIC Region ASes: 1363
Total LACNIC prefixes after maximum aggregation: 494
LACNIC Deaggregation factor: 2.76
Prefixes being announced from the LACNIC address blocks: 1371
Unique aggregates announced from the LACNIC address blocks: 666
LACNIC Region origin ASes present in the Internet Routing Table: 133
LACNIC Prefixes per ASN: 10.31
LACNIC Region origin ASes announcing only one prefix: 57
LACNIC Region transit ASes present in the Internet Routing Table: 25
Average LACNIC Region AS path length visible: 3.9
Max LACNIC Region AS path length visible: 13
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 62
Number of LACNIC addresses announced to Internet: 4107584
Equivalent to 0 /8s, 62 /16s and 173 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
191/8, 200/8, 201/8,
AfriNIC Region Analysis Summary
-------------------------------
Prefixes being announced by AfriNIC Region ASes: 1183
Total AfriNIC prefixes after maximum aggregation: 175
AfriNIC Deaggregation factor: 6.76
Prefixes being announced from the AfriNIC address blocks: 1184
Unique aggregates announced from the AfriNIC address blocks: 235
AfriNIC Region origin ASes present in the Internet Routing Table: 53
AfriNIC Prefixes per ASN: 22.34
AfriNIC Region origin ASes announcing only one prefix: 29
AfriNIC Region transit ASes present in the Internet Routing Table: 10
Average AfriNIC Region AS path length visible: 2.3
Max AfriNIC Region AS path length visible: 10
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 32
Number of AfriNIC addresses announced to Internet: 2447872
Equivalent to 0 /8s, 37 /16s and 90 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8,
APNIC Region per AS prefix count summary
----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 608 2169 463 SINET-AS Research Organization of Informa
7497 453 180 23 CSTNET-AS-AP Computer Network Information
1237 194 74 146 KREONET-AS-KR KISTI, KR
4538 193 4192 72 ERX-CERNET-BKB China Education and Resear
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
7575 171 281 116 AARNET-AS-AP Australian Academic and Rese
55824 148 19 21 NKN-CORE-NW NKN Core Network, IN
4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha
4621 67 37 9 UNINET-AS-AP UNINET-, TH
6262 63 134 56 CSIRO Commonwealth Scientific and Industr
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
16509 2613 1938 1270 AMAZON-02, US
14618 1104 4463 849 AMAZON-AES, US
668 211 648 180 DNIC-AS-00668, US
376 201 162 151 RISQ-AS, CA
5786 187 16 1 UPRENET, PR
2920 179 34 7 LACOE, US
2152 146 491 96 CENIC-2152, US
18558 138 18 4 NETBLK-RCOEK, US
1 128 2 49 LVLT-1, US
81 127 471 35 NCREN, US
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
786 193 1742 187 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
8895 109 24 5 ISU Internet Services Unit ISU, SA
1103 99 1759 85 SURFNET-NL SURFnet, The Netherlands, NL
2614 92 26 69 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
3267 81 29 70 NIKS, RU
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
553 75 366 75 BELWUE BelWue-Koordination, DE
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 328 177 43 Rede Nacional de Ensino e Pesquisa, BR
28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M
11340 110 25 52 Red Universitaria Nacional, CL
271640 67 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR
2715 53 100 36 Fundacao Carlos Chagas Filho de Amparo a
61468 52 3 21 CEDIA, EC
19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR
3596 40 8 4 Universidad Autonoma Metropolitana, MX
28614 38 2 2 Fundacao Universidade Regional de Blumena
1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 576 82 3 KENET-AS, KE
2018 375 318 69 TENET-1, ZA
8094 47 48 18 PUKNET, ZA
37215 37 8 1 MAREN, MW
6879 24 2 9 ENSTINET-, EG
30983 12 4 2 MARWAN-AS, MA
37501 11 49 6 UOFS, ZA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
36982 8 33 8 UCT, ZA
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
16509 2613 1938 1270 AMAZON-02, US
14618 1104 4463 849 AMAZON-AES, US
2907 608 2169 463 SINET-AS Research Organization of Informa
36914 576 82 3 KENET-AS, KE
7497 453 180 23 CSTNET-AS-AP Computer Network Information
2018 375 318 69 TENET-1, ZA
1916 328 177 43 Rede Nacional de Ensino e Pesquisa, BR
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
668 211 648 180 DNIC-AS-00668, US
376 201 162 151 RISQ-AS, CA
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
36914 576 573 KENET-AS, KE
7497 453 430 CSTNET-AS-AP Computer Network Information Cente
2018 375 306 TENET-1, ZA
1916 328 285 Rede Nacional de Ensino e Pesquisa, BR
14618 1104 255 AMAZON-AES, US
5786 187 186 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 179 172 LACOE, US
2907 608 145 SINET-AS Research Organization of Information a
18558 138 134 NETBLK-RCOEK, US
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US
26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-badAS
Advertised Unallocated Addresses
--------------------------------
Unassigned Network ASN Information AS Name
67.158.57.0/24 Origin: 14618 AMAZON-AES, US
67.158.57.0/24 Transit: 16509 AMAZON-02, US
164.160.192.0/21 Origin: 37661 NRaE1-AS, NG
164.160.192.0/21 Transit: 37288 WACREN, SN
192.225.212.0/24 Origin: 14618 AMAZON-AES, US
192.225.212.0/24 Transit: 16509 AMAZON-02, US
192.225.223.0/24 Origin: 14618 AMAZON-AES, US
192.225.223.0/24 Transit: 16509 AMAZON-02, US
198.135.168.0/24 Origin: 14618 AMAZON-AES, US
198.135.168.0/24 Transit: 16509 AMAZON-02, US
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-add-IANA
Number of prefixes announced per prefix length (Global)
-------------------------------------------------------
/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:0 /9:1 /10:1 /11:2 /12:16
/13:27 /14:50 /15:152 /16:2040 /17:444 /18:501
/19:643 /20:993 /21:1015 /22:1571 /23:1758 /24:13545
/25:64 /26:81 /27:99 /28:8 /29:58 /30:0
/31:0 /32:3
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 552 576 KENET-AS, KE
16509 398 2613 AMAZON-02, US
14618 347 1104 AMAZON-AES, US
8895 106 109 ISU Internet Services Unit ISU, SA
1916 88 328 Rede Nacional de Ensino e Pesquisa, BR
1 42 128 LVLT-1, US
23024 38 99 OCDE, US
3267 36 81 NIKS, RU
200521 34 59 SEAP-AGE, ES
28614 32 38 Fundacao Universidade Regional de Blumenau, BR
Complete listing at https://bgp.nsrc.org/REN/Internet2/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:6 3:166 4:2 5:20 6:4 8:2
12:2 13:47 14:93 15:85 16:119 18:105
23:44 24:3 31:3 35:33 37:14 38:11
40:5 41:227 42:18 44:5 45:67 46:7
47:1 49:12 50:8 52:545 54:167 58:15
59:20 60:6 61:3 62:8 63:34 64:120
65:21 66:88 67:64 68:24 69:45 70:12
71:5 72:17 74:79 75:1 76:22 77:11
78:3 79:9 80:13 81:27 82:7 83:8
84:10 85:55 86:6 87:1 88:2 89:17
91:49 92:4 93:47 94:2 95:2 96:8
97:1 98:10 99:56 101:3 102:14 103:376
104:108 107:6 108:28 109:8 110:1 111:21
113:1 114:21 116:10 117:63 118:34 119:31
121:29 122:8 123:8 124:42 125:5 128:59
129:48 130:135 131:72 132:68 133:156 134:116
135:3 136:206 137:65 138:12 139:17 140:40
141:10 142:44 143:31 144:39 145:3 146:138
147:64 148:208 149:16 150:38 151:25 152:143
153:15 154:40 155:111 156:131 157:37 158:34
159:177 160:34 161:26 162:64 163:88 164:20
165:60 166:2 167:23 168:133 169:13 170:83
171:1 172:9 173:28 174:2 175:16 176:2
177:5 178:1 179:13 180:16 181:1 182:12
184:7 185:77 186:4 187:25 188:18 190:17
191:13 192:1593 193:311 194:132 195:78 196:148
197:357 198:514 199:335 200:306 201:23 202:632
203:440 204:397 205:155 206:233 207:260 208:124
209:150 210:223 211:3 212:153 213:16 214:10
216:178 217:24 218:23 219:7 220:16 222:4
223:16
End of report
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